Harry Potter Wiki
Harry Potter Wiki
"As obsessive fans will tell you, I do slip up! Several classrooms move floors mysteriously between books and these are the least serious continuity errors! Most of the fansites will point you in the direction of my mistakes. But the essentials remain consistent from book to book because the story has been plotted for a long time and it is clear in my mind."
J. K. Rowling on the errors within the franchise[src]

Below is a list of mistakes that occur in the Harry Potter book series, such as factual errors, plot holes and typos. Some of these mistakes were fixed in later editions of the same book.[1] Not all of these were mistakes when the book was written; some only became mistakes later on with the release of new, contradictory information (according to this wiki's canon policy, in the case of multiple contradictory statements that would otherwise have equal status, the most recent one trumps). Some of these mistakes are due to newer information in lower-tier canon that's only indirectly contradicted by the books.



  • Although Hogwarts's full name is Hogwarts School of Witchcraft and Wizardry, a distinction between "witchcraft" and "wizardry" has never been made, and the two seem to be just synonymous with the much more used term magic.
    • The distinction between wizards and witches refers solely to their gender; it is possible that "witchcraft" is magic performed by witches and "wizardry" is magic performed by wizards. They still suggest "magic" without implying any actual difference between them, but it is possible this was meant to suggest inclusivity.
    • It is also possible that this is simply a case of synonymia, done for rhetorical effect; after all, "Hogwarts School of Magic" just doesn't have the same ring.
  • Although Hogwarts is said to have a reputation as one of the safest locations in the wizarding world, dangerous events happened with a relative frequency at the school during Harry's years. These included the troll roaming the dungeons in the first year, the Serpent of Slytherin's attacks on Muggle-borns in the second year, a Dementor attacking the Hogwarts Express in the third year, the Triwizard Tournament in the fourth year, and several events relating to the Second Wizarding War in later years. Also, Voldemort followers such as Quirinus Quirrell, Peter Pettigrew, and Barty Crouch Junior all resided in the school for long periods in disguise (or, in Quirrell's case, concealing their true intents), which also posed a significant danger to everyone, especially Harry Potter.
  • J. K. Rowling said in an interview that there are about one thousand students attending Hogwarts at any given time. However, the books mention no more than five students of the same gender, House and year (for example, Harry is known to share a dormitory with only four other boys: Ron, Neville, Dean and Seamus). If this pattern is consistent across the whole school (5 boys and 5 girls per house per year), there would be a total of only around 280 students. If a total of a thousand students was equally divided, each dormitory per house per year would have about 17 to 18 boys or girls.
    • One theory is that Harry's year was an unusually small intake, due to the fact that the time at which those students would've been conceived was during the height of the First Wizarding War and many wizarding families may have been reluctant to bring children into the world at such a dangerous time.
      • Although if that were the case, one would think the incoming first-year classes in Harry Potter and the Prisoner of Azkaban and subsequent books would have been significantly larger, but there's no indication of that.
    • It is also possible that there are more dormitories that don't appear in the books and films. The only ones mentioned in the books are the ones that house the students who are actually in the book, e.g. Harry, Ron, Neville, Hermione.

Date of Albus Dumbledore's death[]

  • According to Pottermore, 30 June 1997 was the date Albus Dumbledore died and, by extension, the date the Battle of the Astronomy Tower occurred.[2] However, several statements spanning Harry Potter and the Half-Blood Prince and Harry Potter and the Deathly Hallows make this date impossible:
    • Immediately before Harry receives Dumbledore's summons to accompany him on the Skirmish at the Cave (therefore, this was the very night Dumbledore died), Harry says he'll be doing detention that Saturday and the two Saturdays afterwards,[3] meaning there's at least 2-3 weeks until the end of the school year, the date of which is firmly established in previous books to be around 30 June.[4][5] This places the date of the skirmish and the Battle of the Astronomy Tower (and therefore Dumbledore's death) sometime in early-to-mid June. There's also nothing to suggest that it was the last day of term (indeed, that the students weren't going home strongly suggests it wasn't), and the early-to-mid June timeframe also fits in with the O.W.L and N.E.W.T exams that were happening at the time.
  • The end of the year is stated to have happened a few chapters later, in The White Tomb.[6]
  • The school year cannot have run into July, as Harry is stated to have been at 4 Privet Drive for at least four weeks as of 27 July.[7][8] This means the school year ended at the end of June as normal. It is also known that there would have been at the very least a few days between Dumbledore's death and his funeral (and, in all likelihood, longer than that, as Dumbledore was such a high-profile person), after which the students were sent home.
  • All lessons and exams were cancelled or postponed due to his death,[6] meaning the school year was ongoing.
  • When Rufus Scrimgeour came to carry out Dumbledore's will on Harry's birthday (31 July), Harry states that Dumbledore died more than a month ago,[9] which means it would have been before 30 June, and even if 'a month' is taken to mean exactly 28 days, it still doesn't necessarily place it at 30 June; it could be any date before 3 July. 30 June, however, would contradict the above-mentioned statement about Harry being away from Hogwarts for at least four weeks (28 days) as of 27 July, as the students had gone home by then (30 June). In the same scene, it was stated that the 31 days (a month, in the sense of the same date in successive months, or in this case as close as possible) for the Decree for Justifiable Confiscation ended on that day,[9] meaning its triggering cannot have coincided with Dumbledore's death (this is the logic used for the 30 June date; it assumes the 31 days started with Dumbledore's death rather than when the items were seized, even though the latter seems much more likely), but would have been some time afterwards, presumably when his will was found or when the Ministry seized the items. It is known that it can take time for wills to be found, as Sirius Black's will wasn't found until early July 1996,[10] even though he died in the middle of June.[11]
  • The Daily Prophet article DUMBLEDORE – THE TRUTH AT LAST?, published on 27 July, mentions that the book The Life and Lies of Albus Dumbledore was completed four weeks after Dumbledore's death.[12] This is sometimes taken to mean 27 July was the completion date for the book, which indeed leads back to 30 June being the date Dumbledore died. However, the article does not actually say this, just that the book was completed four weeks after his death. In fact, the context seems to suggest the book was completed before the article was written, which places the date of Dumbedore's death before 30 June.


  • The books mention several weekdays as having fallen on specific dates (which are either stated directly or known indirectly). However, many of them do not match the actual dates in real life. In particular, the day after the Start-of-Term Feast (i.e. 2 September) seems to be a Monday every year. A possible explanation is a slight calendar difference, either in-universe between the wizarding and Muggle worlds, or between the book world and the real world.
  • Much is made of Hagrid's innocence of attacking Muggle-borns, both from his time as a student and when he was taken to Azkaban as a precaution, but there were several offences that he should in fact have been charged with and wasn't, such as keeping a dragon as a pet, endangering students with some of the creatures in his class and breeding the Blast-Ended Skrewts.
  • The purchasing power of wizarding currency is incredibly inconsistent throughout the series. In the Chamber of Secrets, Molly Weasley is able to purchase supplies for all five of her school age children for one Galleon and 'a very small pile of silver Sickles', but in the Half-Blood Prince a copy of Advanced Potion-Making alone costs 9 Galleons. Furthermore, based on the prices on the Fantastic Beasts and Where to Find Them and Quidditch Through the Ages companion books, this would put the price of the potion book as nearly £45, which seems a lot for a mandatory secondary school textbook. (Although this may also be due to the fact that the book is likely to be imported from Brazil and later translated into English, since the author Libatius Borage, a famous South American potioneer, is a known alumnus of Castelobruxo.)

Harry Potter and the Philosopher's Stone[]


  • The art for the cover of the original UK edition depicts Harry at Platform Nine and Three-Quarters wearing a Gryffindor scarf. However, Harry hasn't been sorted yet. It is possible, however, that the illustration is of Harry returning to Little Whinging at the end of the school term (although given the look of surprise on Harry's face, this is unlikely as his expression would be more appropriate to seeing the train for the first time). Another explanation could be that this was the result of a coincidence in which he already owned a red and gold scarf at the Dursleys' house before starting at Hogwarts.
  • The cover art of the original UK edition depicts another train beside the Hogwarts Express. The train, which is meant to be an InterCity 125, is at a platform that High Speed Trains do not use, but does accurately depict the InterCity Swallow livery of the era.
  • The Bloomsbury Original Adult Edition cover depicts the Hogwarts Express as a Norfolk & Western J class (specifically #602), a class of streamlined steam locomotives that was used in the United States and would be too large for the British loading gauge.

Chapter 1: The Boy Who Lived[]

  • The beginning of the story takes place on a "dull, grey Tuesday." But in 1981, 1 November was on a Sunday.
  • The Muggle news reports an unusually large number of owls awake and flying around in the daytime. However, no mention is made that the owls are carrying packages or letters, which is the only reason so many of them would be out and about during daylight, and for that matter, would make for a much stranger, and therefore newsworthy, sighting by Muggle standards than just the fact that the owls are awake during the day.
  • It is very unclear how much time goes by between certain events on 31 October and 1 November. Sirius arrived on the scene at Godric's Hollow the night James and Lily died, and Hagrid arrived there a short while later. When Hagrid picks Harry up from Godric's Hollow early in the morning "right before the Muggles started swarmin' around," he borrows Sirius' motorbike. However, Hagrid arrives on the motorbike late to Privet Drive when it is "nearly midnight" the next day, having not spoken to Dumbledore since he went to go pick Harry up. As the chapter depicts a whole day between when James and Lily died and when Hagrid arrives at Privet Drive, Hagrid and Harry are missing, or unaccounted for, for nearly 24 hours.
  • It is unknown why Professor McGonagall was posted in her Animagus form next to the Dursleys' home all day, instead of being at Hogwarts tending to her duties as transfiguration teacher and head of Gryffindor House. It is highly unlikely that she was stationed there on Dumbledore's orders, as Dumbledore was surprised to see her there. It is also unlikely that she was there to see Harry be delivered to the Dursleys, as she was surprised and appalled when Dumbledore announced his intention to do so. She only knew that Dumbledore was planning on going there from Hagrid telling her so, but she had no reason to keep tabs on Dumbledore, especially at the expense of her duties at Hogwarts.
    • It is possible that, similar to when exams were cancelled as a school treat amid celebrations after the Serpent of Slytherin was slain in the Chamber of Secrets, the students and staff of Hogwarts were given the day off to celebrate (Dumbledore was surprised, not that McGonagall had been away from Hogwarts, but that she hadn't been celebrating). Given McGonagall's disapproval of the gaieties across the wizarding world, it seems that she had no desire to participate in them, so she just waited for him where she knew he was going to be.
  • Dumbledore says that he passed through several parties to get to Little Whinging, even though he apparently got there by Apparition, a direct form of transport, judging from his sudden appearance next to Minerva McGonagall. He could have Apparated several times to go to many parties, possibly in order to lose anyone, such as Death Eaters, who might have been following him. It is also possible he walked or flew most of the way, and only decided to Apparate a very short distance to Privet Drive, though what motive he would have for this is unknown.
  • In the Bloomsbury edition, on page 17, Hagrid says "I'll be takin' Sirius his bike back"; yet, in Harry Potter and the Prisoner of Azkaban, Sirius told Hagrid to keep the bike because he didn't need it anymore. It is, of course, possible that Hagrid intended to give the bike back in spite of his friend's protests, feeling Sirius may not have meant it. Still, in later editions of this book, the problem was fixed by having Hagrid say "I'd best get this bike away" instead.

Chapter 2: The Vanishing Glass[]

  • Piers Polkiss is described as "a scrawny boy with a face like a rat", but in another part of the book Dudley's gang is described as all being "big and stupid" with Dudley being the biggest and stupidest.
    • Possibly he was scrawny compared to the other gang members but still large compared to Harry who, at that time, was described as "small and skinny".
  • The trip to the zoo is said to take place on a Saturday, but Dudley's eleventh birthday (23 June 1991) was actually on a Sunday.
  • The boa constrictor at the zoo supposedly winked at Harry during their conversation. As snakes don't have eyelids in real life, it is impossible for them to wink. The snake may have been magical or have instead contracted its facial muscles around its eyes to appear to wink, though the possibility of even this is debatable. It is also possible, if unlikely, that snakes in the Harry Potter universe are slightly different from their real-world counterparts, which would go along with their apparent higher intelligence.

Chapter 3: The Letters from No One[]

  • Harry's 11th birthday (31 July 1991) was said to be on a Tuesday. But in 1991 in the real world, that date was a Wednesday.
  • On page 31, the sentence "Harry could see Uncle Vernon's shiny black shoes pacing up and down the kitchen" begins with a speech mark, even though the line is not being spoken by anyone. It is amended in later editions.

Chapter 4: The Keeper of the Keys[]

  • Hagrid tells Harry that "There's not a witch or wizard who went bad who wasn't in Slytherin." However, Peter Pettigrew betrayed Harry's parents and he was in Gryffindor. While Hagrid didn't know at the time that Pettigrew was the traitor, he did believe that Sirius was, and he was also a Gryffindor, so Hagrid's statement is incorrect from either perspective.
  • Hagrid says that when he was expelled, Dumbledore let him stay on as gamekeeper. In Harry Potter and the Chamber of Secrets, it is revealed that Armando Dippet was headmaster when this happened, so it would have been he, not Dumbledore, who let him stay on. Also, in Harry Potter and the Goblet of Fire, Molly Weasley says that Ogg was gamekeeper during her time as a student (the 1960s, well after Hagrid's expulsion), so he cannot have stayed on as gamekeeper exactly (see also below).
    • One theory is that Dumbledore persuaded Dippet to let Hagrid stay on as Ogg's assistant, and Hagrid simply took over when Ogg left.
    • Another explanation is that Ogg took over from Hagrid at some point, and Hagrid took over from him again afterwards.

Chapter 5: Diagon Alley[]

  • When Hagrid finds Harry at the Hut-on-the-Rock to deliver his Hogwarts letter, he says he "flew" to the island, but it is uncertain how he did so. In Harry Potter and the Deathly Hallows, he says brooms and Thestrals can't take his weight, and there was no sign of either them or Sirius Black's motorbike, which was likely still in his possession.
    • He says that the reason he chose not to fly away was because he's not allowed to use magic now that he has Harry, which means Hagrid must have performed Unsupported flight (in Deathly Hallows, Alastor Moody says that other forms of flight, including brooms and Thestrals, do not set the Trace off because one does not need to cast a spell to use them, meaning they do not count as using magic; indeed, Harry is seen in Deathly Hallows and Order of the Phoenix flying on a broom when he wasn't allowed to use magic). However, this does not tally with what we learn about it later in the series, particularly the implication in Deathly Hallows that Voldemort is the only wizard capable of it, at least until Severus Snape is shown doing it (and it is implied that he learnt it from Voldemort).
  • It is unclear as to how the Dursleys' left the island following Hagrid's visit, considering Hagrid and Harry took the rowboat the family arrived on.
    • It is possible Hagrid sent it back by magical means, but this is never stated.
    • It is also possible the hut owner rowed it back to the island for them or picked them up.
  • On Harry's Hogwarts list of school supplies, "1 Wand" is listed twice, as both the first and last item on the list. This mistake was fixed in later editions of the book. The list of school supplies also doesn't include potion ingredients, although Harry later buys them. In later editions of the book this has been corrected.
  • Harry, while passing a 'plump woman' outside an Apothecary, overhears her exclaim "Dragon liver, seventeen sickles an ounce [...]". Hagrid later explains that there are 17 silver sickles to a galleon. In this case, it is unrealistic that the witch would refer to the 17 sickles instead of 1 galleon. In later editions, this error has been corrected, replacing 'seventeen sickles' with 'sixteen sickles'.
  • Harry buys the book One Thousand Magical Herbs and Fungi, but later, he looks up dittany in "One Hundred Magical Herbs and Fungi". This error was, however, amended in later editions.
  • The air in the tunnels of the Gringotts vaults is described as getting colder going deeper into the ground. However, in theory, it should get hotter as one goes deeper below the surface of the earth. Of course, there may be enchantments in place to account for this discrepancy.
  • When Harry returns from Diagon Alley to Little Whinging, he takes a train from Paddington Station. However, Little Whinging is in Surrey, south of London, so he should have travelled from Victoria or Waterloo; trains from Paddington head to the west.
  • Despite Garrick Ollivander's claims that the original Ollivander arrived to Great Britain with the Romans, this individual started his wand-making business in 382 B.C. but the Roman conquest of Britain (Britannia) only began effectively in A.D. 43, under Emperor Claudius. An earlier attempt was made in 55-54 B.C. by Julius Caesar, as an adjunct of his Gallic campaign. Prior to then, the Romans had only sporadic contact with Britain, to the point where, up until 124 B.C., many Romans did not believe the land actually existed.
  • It is unclear how Dumbledore knew that someone was going to attempt to steal the Philosopher's Stone. Presumably, the plan was top secret, with Dumbledore and Flamel being the very last people Voldemort wanted to know about it. Indeed, three years later, in the fourth book, Dumbledore remained unaware of the plan to resurrect Voldemort, and that was with the mastermind behind the plot, Bartemius Crouch Junior, impersonating "Mad-Eye" Moody, being in his presence for ten months. It is also unclear how Voldemort or Quirinus Quirrell knew where the Stone was at the time.
  • It is also unclear as to why Dumbledore thought the Stone was not completely safe at Gringotts, given that no-one had ever successfully robbed it before. Indeed, in this very chapter, a big deal is made of how foolish and futile it would be to attempt to rob Gringotts.
    • Although Hagrid says that Hogwarts is possibly even safer than Gringotts, this seems to be entirely in his judgement or opinion rather than being based on any hard facts.

Chapter 6: The Journey from Platform Nine and Three-Quarters[]

  • Aunt Petunia is described as looking as surprised as the other Dursleys about Harry needing to board at Platform Nine and Three-Quarters, yet according to Harry Potter and the Deathly Hallows, she had been there at least once. However, she may have been pretending to be startled in order to distance herself from the magical world.
  • Mrs Weasley asks her children which platform the train departs from, but she should know this perfectly well, since she departed seven times from the same platform. However, it is possible she only asks so her children remember.
  • On page 79, the closing quotation mark is missing right after Hermione tells Harry about the books he is in. This mistake was fixed in later editions of the book.
  • King's Cross Station is described like St Pancras Station, instead of King's Cross.
  • When Harry gets his first view of Hogwarts, it's described as being on a cliff overlooking the lake, and they get there via a tunnel that comes up on the lawn near the entrance doors. We never hear of this tunnel again, and for the rest of the series the lake is described as being on the grounds, at or near the same level as the castle.

Chapter 7: The Sorting Hat[]

  • None of the new students know beforehand what the Sorting Ceremony involves. While this makes sense for the Muggle-borns and Harry, as they had no knowledge of the wizarding world, it doesn't for those that have grown up in it. Even Ron has no idea, despite having two parents and five older brothers as current or former students, and it seems highly implausible that none of them ever mentioned it to him (other than Fred joking about wrestling a troll).
  • While being sorted into houses, Harry looks up at the Sorting Hat's stool, and there are only three people left to be sorted. Professor McGonagall then calls out the names of four more students. This error only occurred in the US edition and was rectified in later editions – in the UK edition Dean Thomas's name is omitted.
  • During the Sorting Ceremony, Sally-Anne Perks is sorted before Harry but in Harry Potter and the Order of the Phoenix, when everyone in fifth year are being called in alphabetical order to take their practical O.W.L.s, Parvati Patil is called before Harry. It should actually have been Sally-Anne Perks, but because many students were pulled out of the school that year, it is possible that Sally-Anne was cut out.
  • When Harry first meets Nicholas de Mimsy-Porpington, the ghost says how he has not eaten in nearly 400 years. At the time, he had already been dead for 99 years longer than that. This was fixed in later editions of the book.
  • It was stated in a previous chapter that Harry's birthday, 31 July, was on a Tuesday (regardless of what day it actually fell on in 1991), which would mean that 1 September was on a Saturday. The next day would have been a Sunday, yet classes began.

Chapter 9: The Midnight Duel[]

  • Fred tells Harry that the Gryffindor Quidditch team hadn't won a championship "since Charlie left". Charlie attended Hogwarts from 1984-1991, and so had only just graduated as Harry arrived – Harry filled the seeker vacancy left by Charlie. It is a strange way to put it since no time had really passed since Charlie left, though Fred is still telling the truth as they hadn't won since 1986 which is when Charlie attended.
    • It is possible Charlie, while still at school, had left the Quidditch team a few years before actually leaving Hogwarts, which would fit with Professor McGonagall expressing the need for a better team than the previous year.

Chapter 10: Hallowe'en[]

  • During the Hallowe'en feast, when the troll is let in, Professor Dumbledore sends the students to their dormitories, but the troll is said to be in the dungeons, and that is also where the Slytherin dormitories are, meaning that Dumbledore has put them directly in harm's way by sending them there.
  • When Harry set off for the Quidditch pitch at coming up to 7pm on the first Friday of term, it's described as dusk. However, sunset in the Scottish Highlands at the beginning of September is around 8pm. Therefore, it would still have been daylight when Harry went to the Quidditch pitch. This also means that it should not have been too dark to practise with the Snitch, for it is highly unlikely to have taken over an hour for Wood to explain the rules of Quidditch.
    • It is possible that the British wizarding world does not have British Summer Time and goes by Greenwich Mean Time all year round. This would also help explain the other time/sunset/daylight mistakes in the series.

Chapter 12: The Mirror of Erised[]

  • Dumbledore tells Harry that the Mirror of Erised 'gives us neither knowledge nor truth'. However, it does in the sense that it shows the viewer their deepest desire, even if they don't know what it is, thus giving them that knowledge.

Chapter 13: Nicholas Flamel[]

  • Harry goes to put his broomstick back in the broomshed. This is the only time a broomshed at Hogwarts is mentioned; for the rest of the books Harry keeps his broomstick in his dormitory.

Chapter 14: Norbert the Norwegian Ridgeback[]

  • The night Charlie's letter shows up at Hogwarts is said to be Wednesday at midnight. However, earlier in the book it is mentioned that Astronomy classes take place every Wednesday at midnight which means that they are presumably skipping class, and the other students should not be asleep. Later editions have changed the day of Charlie's visit to Saturday.

Chapter 16: Through the Trapdoor[]

  • Quirrell finds out how to get past Fluffy when he gets Hagrid drunk and gives him the dragon egg. This happens during the Easter holidays, but Quirrell doesn't actually go after the Stone until two months later.
  • Harry jumps down a dark hole that he can't see the bottom of, which is foolhardy enough, and while they're in the process of getting through a series of deadly obstacles. Just as likely there'd be a bunch of big sharp spikes at the bottom as a nice cushiony (if also deadly) plant.
  • During the match against the giant chess set, Ron says "Well, Harry, you take the place of that bishop, and Hermione, you go next to him instead of that castle." Except the castle is next to the knight, not the bishop. It is possible though that when Ron said "next to him" he didn't mean immediately next to, only in the general area of where Harry was located.
  • Also in the match, Harry was acting as the bishop. His last move was to move three spaces to the left. However, in real chess bishops can only move diagonally. However, it could also mean that Harry simply moved 3 spaces left diagonally, and wasn't written properly.
  • At the beginning of the same match, Ron is the knight in the giant chess set. It later says that he had to "move ahead one" so that the Queen could take him, opening the path for Harry to checkmate the king, and win the match. If he were a knight, he would only be able to move either ahead one, and sideways two, or ahead two, and sideways one. It is possible, however, that "one" was meant as one move, rather than one space.
  • When Harry and Hermione drink the two potions to get them through Snape's task, there is only one bottle to get them through the black fire and only one bottle to get them through the purple fire. The smallest bottle holds the potion for the black fire, and it only contains enough for one person. If this is so, then it is unknown how Quirrell got to the Mirror of Erised in the first place.
    • Although, it's possible that the task just reappears again, just like the chess set was intact and Harry, Ron and Hermione had to play the game again.
    • It is also possible that Quirrell had only taken a sip of the potion himself, therefore only leaving enough for one more person.
  • The Stone is described as having the best protections the staff could devise, but three 11-year-olds were able to defeat them without significant difficulty, as was the very person they were trying to protect it from. For one thing, why is the correct key in the first room, as opposed to Dumbledore having the key in his inside pocket?
  • If Dumbledore's letter from the Ministry really was urgent, it seems odd that he would choose to fly all the hundreds of miles there rather than get there almost instantly by Floo powder or Apparition (though the former had yet to be introduced). He could have done that and seen right away that it was a trick, so Quirrell and Voldemort's scheme to lure him away by falsifying business with the Ministry falls right apart.

Chapter 17: The Man with Two Faces[]

  • Why did Quirrell need to create a diversion with the troll in order to see what was guarding the Stone? Why couldn't he just have gone and looked, maybe late at night? After all, that's how Harry, Ron and Hermione found out. And why didn't he know in the first place, as a faculty member who had helped create the protections for the Stone?
  • Dumbledore says that he and Hermione's owl crossed in mid-air. However, a few pages later Hermione says to Harry that she ran into Dumbledore on the way to the Owlery to send him the owl.
    • He actually says "We must have crossed in midair", indicating that he is making an assumption. Harry merely informed him of Hermione's intention to send an owl. Since Dumbledore is not omniscient (as he admits himself) the explanation he'd assumed for why he hadn't received it may have been wrong, as he didn't know she hadn't sent it.
  • How does Dumbledore know that Lily sacrificed herself for Harry, and when did he find this out? At the start of the book, he tells McGonagall that "we may never know" how Harry survived, but in Harry Potter and the Order of the Phoenix, he states that he chose to leave Harry with the Dursleys specifically because of Lily's sacrifice. Even the existence of the Tracking spell does not explain this, as in Harry Potter and the Prisoner of Azkaban, it is revealed that Hagrid, who was not allowed to use magic, was the one who went to the scene afterwards to rescue Harry, and that he was already under orders to take him to the Dursleys.
  • Dumbledore explains that only a person who wanted to find the Stone, but not use it, would be able to get it. However, this presents several problems:
    • By that logic, Quirrell should have been able to get the Stone without any problem, as he did not want to use the Stone himself, only present it to Voldemort.
      • It's possible that the Mirror regarded Voldemort and Quirrell as a single person as they were inhabiting the same body, although this is unlikely, as by that logic it would also have detected the piece of Voldemort's soul inside Harry.
      • It's also possible that the Mirror knew that Quirrell wanted to give the Stone to Voldemort, which is still using it, just not on himself.
    • If the Mirror guards the Stone against theft that well, what was the point of the other obstacles? If anything, the presence of extra obstacles to guard something that's already impossible to steal for personal gain would attract potential thieves.
      • One possible explanation is that they were to guard against theft for purposes other than personal gain, e.g. to simply prevent others from using it. Indeed, this is how Harry was able to get the Stone from the Mirror. However, preventing others from using it was the whole reason the Stone was heavily guarded in the first place. Therefore, there would have been no need for anyone to steal the Stone for that purpose, unless they wished to prevent its owner from using it. However, Voldemort did not wish to prevent its owner from using it per se; he wanted to use it on himself. Therefore, the Mirror alone would have been sufficient.
    • Ironically, the Mirror put the Stone in danger of being stolen when it gave the Stone to Harry, as it was already perfectly safe from Voldemort. Therefore, Harry's plan to keep the Stone safe was not only unnecessary (though he didn't know about this at the time), it almost backfired spectacularly (as opposed to merely failing, as the book implies). Getting through the laughably inadequate defences and entering the room with the mirror was the single worst thing Harry could possibly have done. Yet, none of this seemed to occur to Dumbledore when he told Harry about this protection.
      • One possibility is that the Mirror acted a bit like a computer: it was "programmed" to give the Stone to someone who did not want to actually use it, regardless of the risks in doing so (computers of course cannot think like sentient beings), which is exactly what the Mirror did when it saw Harry.
    • Harry speculated that Dumbledore knew Harry, Ron, and Hermione were going to try to stop the Stone from being stolen and even discreetly helped them, but, as explained above, this was entirely unnecessary.
      • Harry could have simply been mistaken (indeed, Dumbledore says in the fifth book that Harry's encounter with Voldemort here was much sooner than he had anticipated, on a timescale of years), but this begs the question of why Dumbledore let Harry off when he caught him by the Mirror over Christmas.
        • It is of course possible that Dumbledore did not know that it was Voldemort who was behind the plot to steal the Philosopher's Stone (indeed, Hogwarts would have been an illogical choice of location for safekeeping if Dumbledore knew that the one behind the plot was controlling one of his teachers!).
    • If nobody could acquire the Stone if they wanted to use it, then it is unclear how Nicolas Flamel was supposed to get it in order to make more Elixir of Life. Perhaps he had already decided that he was ready to die and had no desire to have the Stone anymore, but then, why didn't he and Dumbledore just destroy the Stone as soon as it was retrieved from Gringotts?
      • It is possible that Dumbledore would have lifted the spell if Flamel needed the Stone.
    • Dumbledore could have done the mirror trick with the Stone and just left it in that disused classroom, and it would have been much safer.
    • The mirror wasn't moved to the chamber under the school until after Christmas. Where was the Stone before that?
    • It is unknown why Dumbledore and/or Flamel could not have used the Fidelius Charm to hide the stone and/or its whereabouts.
    • The Stone's defences evidently had a "back door" of some sort that enabled Dumbledore to get to Harry without having to play through the chess board, etc.
  • Dumbledore says that he came across a vomit-flavoured Bertie Bott's Every Flavour Bean in his youth, but Bertie Bott was born in 1935, and Dumbledore was born in 1881. Therefore, Dumbledore would have been well into his 50s when their inventor was born, and likely in his early 70s (an age most would consider to be elderly) at the youngest when the beans were invented sometime in the mid 20th century, assuming Bott attended and finished Hogwarts as normal and that the beans were invented afterwards.
    • It is possible that as Dumbledore was a supercentenarian, he was thinking of himself as comparatively youthful.
    • It is also possible that, as wizards tend to have a much longer lifespan than muggles (comparatively few muggles get to be supercentenarians), they have a correspondingly different definition of 'youth'.
  • Hermione says she and Ron came across Dumbledore in the Entrance Hall on their way up to the Owlery. In the previous chapter, just before entering the final chamber, Harry told them to use the brooms to get back through the trapdoor, so they'd have been in the third-floor corridor (indeed, Dumbledore is said to have hurtled off to the third floor after seeing Ron and Hermione in the Entrance Hall). The Owlery is in West Tower, accessible via the fourth-floor corridor. The Entrance Hall, however, is on the ground floor, so how they came to be there on their way up from the third floor is a mystery.
  • Ron says "you missed the last Quidditch match, we were flattened by Ravenclaw without you". But earlier in the book, Harry told Ron that if he didn't play, Gryffindor couldn't play at all because there wasn't a reserve Seeker.
  • Also, this is the only time we hear of a Quidditch match played after exams, and we never see Harry training for it.

Harry Potter and the Chamber of Secrets[]


  • The UK version of the cover illustration of Harry, Ron, and Hedwig in the flying Ford Anglia incorrectly depicts Hedwig as a barn owl rather than a snowy owl.
  • On the front cover of the Spanish edition, Harry is holding the sword and looking at the Basilisk, but looking into a Basilisk's eyes is fatal, so, technically, Harry should be dead on the Spanish front cover. However with Fawkes having clawed out the Basilisk's eyes, Harry would be able to look on without fear of death.

Chapter 2: Dobby's Warning[]

  • Petunia should have been aware that underage wizards and witches are not allowed to use magic outside of school, since the rule was written in 1875, well before Lily's time at Hogwarts. However, it could have been that Lily had simply forgotten to mention this to her. It should be noted that in book 1 during Harry's birthday, she claimed that Lily "turned teacups into rats".
  • The Ministry of Magic detected Dobby using the Hover Charm and assumed it was Harry. However, by that logic, they should have also detected the Disapparition Spell performed immediately after the Hovering Charm, and realised that this spell was far above the paygrade of a second-year student.
  • Sending an owl to deliver a letter, in the presence of two Muggles who did not know that wizards exist, ironically does far more to expose the existence of the wizarding world to Muggles than a spell that happened when those Muggles' backs were turned.

Chapter 3: The Burrow[]

  • Why didn't Fred, George, or Ron activate the Flying Ford Anglia's Invisibility Booster (when it is activated when Harry and Ron begin to fly the car to Hogwarts later on in the book, it is described like Harry's first experience with it), and how come no one other than the Dursleys noticed the car flying? They were travelling at night, so they presumably needed the headlights on to be able to see, and that would have been a huge giveaway in the dark. Even at night, there would have been people out and about, so Fred, George, Ron, and Harry would have had to have been extremely lucky not to be spotted.
    • Fred did claim the sky was cloudy, but what about aeroplanes?
    • It is also possible that they did not have the headlights on, and were somehow relying entirely on the compass on the dashboard for navigation.
    • As for why they didn't use the Invisibility Booster, it's possible that it wasn't installed until after Harry's arrival at The Burrow, but this is never stated.
  • After Harry, Ron, Fred, and George arrive at The Burrow, Mrs Weasley shouts at Fred first. Then she says, "and you two" glaring at Ron and Fred, but it should say George since she has already yelled at Fred. This error was corrected in later editions of the book.
  • When Harry, Ron, Fred, and George arrive at The Burrow, Mrs Weasley says that she and Mr Weasley had been worried about him and were just the previous night talking about coming to get him, yet when Mr Weasley is informed that Harry had already arrived, he didn't seem to know who he was, and actually asked 'Harry who?'. A somewhat strange reaction from someone who'd been worried about him and had been talking about coming to fetch him.
    • It is possible that he momentarily forgot about Harry due to being shouted at.
  • In the US edition of the audiobook read by Jim Dale, Ginny's eyes are stated as being bright green but in the printed US first edition, and the UK version of the audiobook read by Stephen Fry, they are said to be bright brown, which agrees with the description in Harry Potter and the Deathly Hallows of Molly's eyes being the exact same shade of brown as Ginny's.

Chapter 4: At Flourish and Blotts[]

  • The Hogwarts equipment list mentions the Lockhart book "Wanderings with Werewolves", but later, Lockhart refers to the book as "Weekend with a Werewolf". This error was fixed in later editions of the same book.

Chapter 5: The Whomping Willow[]

  • When Harry and Ron arrive at Hogwarts in the flying Ford Anglia, a scene which takes place on 1 September 1992, they are told that they had been seen by Muggles in various locations, including the "Post Office Tower". But due to a change of ownership, the tower has actually been called the BT Tower since 1984. Also, the building is about a mile southwest of King's Cross, so to pass it, Harry and Ron would have had to be going in an entirely different direction to be following the Hogwarts Express.

Chapter 8: The Deathday Party[]

  • Harry, Ron and Hermione go to Nearly Headless Nick's 500th deathday party. However, in the first book at the start of term feast he says he has not eaten for nearly 400 years, which would imply that this is how long he has been dead.
    • In later printings of the first book, Nick's comment is changed from "nearly 400 years" to "nearly 500 years".
  • Why was Draco Malfoy amongst the students going up to their dormitories after the feast? The Slytherin dormitories are, as revealed later on in the book, in the dungeons.

Chapter 9: The Writing on the Wall[]

  • Binns scornfully calls the Chamber of Secrets a myth with no basis in fact. Yet the Chamber had been opened fifty years previously, resulting in the death of a girl, and as Binns was described as having been "very old indeed" when he died and continued teaching as a ghost, it means he was teaching at Hogwarts back then and would have known about the attack. And Binns, according to Hogwarts Legacy, was teaching as a ghost in the 1800s.
  • Ron states that Fred turned his teddy bear into a spider when Ron was 3. That's kind of an extraordinary bit of Transfiguration from a 5-year-old.
  • Hermione says that Moaning Myrtle haunts the bathroom on the first floor. However, when Harry sees the writing on the wall outside her bathroom, he is on the second floor.
  • It remains unknown how Moaning Myrtle never notices Ginny visiting her bathroom, or the pipe door opening, or the Basilisk coming through her bathroom.
    • It is entirely possible that when the piece of Riddle's soul possessed Ginny, she temporarily gained some of his powers, likely including the ability to disillusion herself. She would have gained the ability to speak Parseltongue, or she wouldn't have been able to open the chamber. It is highly unlikely that Riddle would have got very far if he was limited to the abilities of a typical first-year.
    • It is known that Myrtle does not spend all her time in the bathroom. It is therefore possible that Ginny/Riddle simply waited until she was away from the bathroom before opening the chamber. Riddle, being one of the world's most powerful wizards, presumably had some means of knowing whether she was there.
  • Percy's name is once misspelled as Perry after he catches Harry, Ron and Hermione leaving Myrtle's bathroom.

Chapter 10: The Rogue Bludger[]

  • How can anyone have thought Harry could have been responsible for the attack on Colin Creevey, when he was flat on his back in the hospital wing when it happened?
  • If Colin had in fact got a photo of his attacker, Dumbledore would have destroyed it by opening the back of the camera.

Chapter 11: The Duelling Club[]

  • When brewing the Polyjuice Potion, Hermione says that she should steal the ingredients from Snape's stores, rather than Harry or Ron, as they will be expelled if they're caught, whereas her record is clean. However, that isn't entirely true, because she claimed to have gone looking for the troll in their first year and lost five points for it, plus she was caught out of bed the night that she and Harry sent Norbert to Charlie.
    • However, this might be related to the current school year, for which her record was actually clean. Harry and Ron on the other hand caused great troubles with their arrival to school, after which they both got a warning from Dumbledore that any more violation of rules will cause their expulsion from school, a warning which wasn't related to Hermione in any way.
  • When Harry speaks Parseltongue to the snake during his duel with Draco, everyone hears him hissing. Therefore, when Harry hears the Basilisk speaking in the walls, Ron and Hermione should hear hissing, yet they claim to hear nothing.
    • A possible explanation for this could be that the Basilisk is hissing very quietly or is muffled by the pipes and the walls, so Ron and Hermione can barely hear it, but Harry can make out the words as he hears them in English.
  • At this point in the book, it is known that the Chamber of Secrets has been opened, that the Monster of Slytherin dwells within it, that only the Heir of Slytherin can control it, that the emblem of Slytherin house is a serpent, and that Salazar Slytherin was so famous for being able to talk to serpents, he was called Serpent-tongue. Yet, it apparently never occurs to anyone that the Monster of Slytherin is therefore likely to be a serpent. As the King of Serpents, a Basilisk was the most obvious possibility, yet Hermione only guessed that the monster is a Basilisk later on, and Harry only knew after seeing the page that Hermione torn out of a book. Given that the information was apparently found in an unrestricted library book, it is unlikely that Basilisks are not common knowledge.

Chapter 13: The Very Secret Diary[]

  • When Harry is viewing the memory from Tom Riddle's diary, Tom Riddle says to Hagrid at one point, "The dead girl's parents will be here tomorrow." It is stated elsewhere in the book that Myrtle is Muggle-born. Muggles cannot enter Hogwarts. However, it is possible that an exception was made for them (the Muggle-Repelling Charm could be lifted a day or two, for this reason), or it could be that Tom simply assumed that Myrtle's parents were wizards (although this is highly unlikely, since it is later revealed that he was the heir of Slytherin, and thus had personally sought to bring about Myrtle's death, meaning he must have known that she was a Muggle-born). Another possibility is that he may have been bluffing in order to scare Hagrid.
  • Valentine's Day in the book is depicted as a typical school day, albeit one where the cupid dressed dwarfs are interrupting classes. 14 February 1993 was a Sunday, meaning there should have been no classes to interrupt.

Chapter 14: Cornelius Fudge[]

  • When Harry is at the Quidditch pitch, after reflecting with relief that there will be no one in the castle to become victims of the monster of Slytherin, Professor McGonagall shows up to say that the monster has struck again, and that everyone should return to their common rooms. However, the students would have been far safer to remain at the pitch while the professors checked the castle again.
    • It should be noted that, at the time, no one knew what the monster was or how it was attacking students; therefore, there was no reason to assume the students were safe outside (Harry was likely being naïve in assuming that, for he had no reason to think that at the time). The common rooms were presumably the students' default sanctuary, and it is likely they were sent there so they were together and the teachers knew where they were.
  • It is written that "Harry had inherited just one thing from his father: a long and silvery Invisibility Cloak". This is untrue, as we find out in Chapter 5, Diagon Alley in Harry Potter and the Philosopher's Stone, that Harry also inherited James and Lily's gold, kept at Gringotts.
    • This is probably intended to mean that he only inherited one actual item, as opposed to a commodity such as money.

Chapter 15: Aragog[]

  • Ernie MacMillan apologises to Harry for suspecting him when they run into each other in Herbology. This was two weeks after the attack on Hermione, which is what made him realise Harry couldn't be the culprit.
  • That same day, Lockhart cheerfully remarks that the culprit had been found and everyone should be happy, as if Hagrid's arrest had happened the previous night rather than two weeks before.
  • When Harry tells Ron to be quiet or the 'something big' will hear them, Ron responds, "Hear *me*? It's already heard. Fang!" However, the sentence should probably be "It's already heard Fang!" as it is read in the audiobooks. It is amended in later editions.
  • When Harry and Ron go to visit Aragog, the grounds are described as moonlit. This is presumably intended to mean that the moon was the only source of illumination, due to the sky being completely dark. But the date can be deduced to be 25 May (in the next chapter, 1 June is stated to be a week away from that very morning), which, at that latitude, never gets darker than nautical twilight,[13] meaning there would have been a fair amount of twilight, maybe even enough to partially eclipse the moonlight.

Chapter 16: The Chamber of Secrets[]

  • It is stated that the Basilisk was able to move through the castle's pipes, but it remains unknown how something as large as the Basilisk would be able to fit through the plumbing.
    • Based on the fact that Harry, Ron and Lockhart are able to move through the plumbing to get to the Chamber later on, it may be that the pipes for Hogwarts are simply that large, or may change shape depending on their load, just as the staircases can move.
  • If the school was on full lockdown, with students escorted everywhere in the castle, how was Ginny able to get away to write the message on the wall and go to the Chamber of Secrets?
  • It makes absolutely zero sense whatsoever that Harry and Ron do not immediately tell McGonagall that they had figured out where the entrance to the Chamber was, after Ginny was apparently taken by the monster.
  • Dumbledore, the Ministry et al. have to have known that Moaning Myrtle was the ghost of the girl who was killed the first time the Chamber was opened. Why did nobody ever ask her about it before?
  • Why do Harry and Ron drag Lockhart along with them? They already know he's incompetent even before they find out the true depths of his fraud, and then they take him along anyway.

Chapter 17: The Heir of Slytherin[]

  • It is unclear how Fawkes spoke Parseltongue to enter the Chamber of Secrets to intercede for Harry, nor how Ron could have been strong enough to help him get past the rubble caused by Lockhart's spell.
    • It's likely that Fawkes simply Apparated past any barriers in his way, because it's known that phoenixes can disappear and reappear somewhere else naturally.
  • Tom Riddle states that Lily Potter's death bought Harry "twelve years of borrowed time". This is incorrect as he had not yet turned thirteen, and Lily died when he was one, and so it should be "eleven years of borrowed time".
  • Harry, Ron and Lockhart get carried back up the pipe by Fawkes. How did Ginny get back up, the times she released the Basilisk? For that matter, how did Riddle fifty years previously? Maybe they hung onto the Basilisk's tail.
    • Unsupported flight is something Riddle is shown at the Battle of the Seven Potters to be able to do. It is possible that he knew how to do it when he was at Hogwarts. As for Ginny, it is possible (likely, even), as previously mentioned, that Riddle's soul fragment transferred some of his powers to Ginny, like the one in Harry did to him. However, it seems strange that Harry did not seem to have this ability.
    • It is also possible that Riddle flew out on a broomstick, like Ron and Hermione did during the Battle of Hogwarts in Harry Potter and the Deathly Hallows. However, Ginny presumably did not have access to a broomstick, so this doesn't explain how she got out.

Chapter 18: Dobby's Reward[]

  • On page 283 of some copies of both the US paperback and hardback editions, the word "professor" is misspelled as "professorr".
  • Dumbledore tells Harry that Lord Voldemort is the last remaining ancestor of Salazar Slytherin. This is meant to say that Lord Voldemort is the last remaining descendant of Salazar Slytherin.
    • This error was fixed in later editions of the book.
  • Dumbledore concedes that nobody will ever be able to prove that Lucius Malfoy slipped Tom Riddle's diary to Ginny before the start of term, let alone did so with the intention of opening the Chamber of Secrets; thus, Lucius could not be prosecuted. At the time Dumbledore says this, this is true. However, only a few minutes later, they suddenly have a witness they could have used against Malfoy: The newly freed Dobby! Bear in mind that, in Order of the Phoenix, Dumbledore offers to summon Dobby to give evidence in Harry's defence, and the Minister decided to accept Harry's version of events without needing the evidence. So clearly, house-elves are not considered incompetent witnesses by the Wizengamot.

Harry Potter and the Prisoner of Azkaban[]


HP3 Cover

Full Scholastic (US) cover and back cover art

  • On the US version of the cover, the front art is the night that Harry and Hermione save Sirius and Buckbeak. However, on the back side of the cover (Lupin appears as a werewolf), the moon is a crescent, but it should be a full moon.
  • The cover of the Scholastic edition and British Bloomsbury edition both depict Harry and Hermione riding Buckbeak. Harry's legs are shown to be in front of Buckbeak's wings, however, when Harry was in Care of Magical Creatures and rode Buckbeak for the first time, Hagrid had told him to sit behind the wing joint, as he did in the films. However, this may have been because Hermione is sitting behind him.
  • On the back cover of some editions, it said that Harry blew up his Aunt Petunia instead of Aunt Marge. This error was fixed in later editions of the same book.

Chapter 1: Owl Post[]

  • In earlier editions of the book, the first page stated that A History of Magic was written by Adalbert Waffling, rather than Bathilda Bagshot.
    • This was rectified in later editions of the same book.
  • When Harry is looking at his scar and how it came to be, the reader is informed that his parents had been murdered by the most feared dark wizard for a hundred years, Lord Voldemort. This is false; Voldemort was actually the most feared dark wizard of all time.
    • It may just be an instance of poetic licence.
  • In her letter accompanying the Broomstick Servicing Kit that she sent to Harry from France, Hermione expresses concern over the possibility of the package being opened at Customs. However, the UK was still in the European Union in 1993, so there wouldn't have been any Customs checks on goods arriving from France.
    • It is possible that Hermione did not know that there wouldn't have been a Customs check, although being Muggle-born she would likely be a lot more familiar with the politics of the Muggle world than most wizards.

Chapter 2: Aunt Marge's Big Mistake[]

  • Harry accidentally does magic without his wand in response to being scared or angry when he's at the Dursleys', here and in Harry Potter and the Philosopher's Stone. But he never does this at any other time, even when in much more perilous situations.
    • As Dumbledore mentions to Tom Riddle in the orphanage in the sixth book, magical education teaches students to control their magic as well as use it, so Harry would've had more control over his by then and losing it in this situation is implied to be an exceptional occurrence.
  • When Harry leaves the Dursley's house after blowing up Aunt Marge like a balloon, he, at least in that moment, has the intention of never returning to the Dursleys' home ever again. The bond of blood should have therefore been broken, making him fair game for Voldemort and/or the Death Eaters.
    • It is possible that he may have known deep down that he would end up returning, even if he didn't consciously want to at that moment.

Chapter 3: The Knight Bus[]

  • When Harry travels on the Knight Bus, 'Anglesey' is misspelled as 'Anglesea'.
  • When Hedwig greets Harry in the Leaky Cauldron, it says that she 'clicked her break' instead of 'beak'.
    • Both these spelling mistakes are fixed in later editions.
  • Hagrid is stated to have spent two months in Azkaban during the previous school year. The date he was taken away can be deduced to be around 10 May; the morning after Harry and Ron's visit to Aragog is stated to be one week before 1 June (which puts it at 25 May), and the previous day (24 May) is stated to be around a fortnight after he was taken. The Skirmish in the Chamber of Secrets happened on 29 May, and Hagrid was released that night, making the length of his imprisonment in Azkaban around three weeks, not the two months stated here.

Chapter 4: The Leaky Cauldron[]

  • When Harry is buying his books at Flourish and Blotts, it mentions that he is being served by the manager, but when Harry is staring at the book Death Omens, it says that he is being served by the assistant of the store. Although, it is possible that the manager was simply the assistant to the shop owner.
  • The store clerk immediately moves to the cage with the "Monster Books of Monsters" inside them as soon as he sees Harry. However, as Care of Magical Creatures is only an elective for third year students, he had no reason to automatically assume that Harry needed that book without checking first.
    • It is possible that the clerk thought that Care of Magical Creatures was compulsory, or he had got a glimpse of Harry's booklist as he entered the shop.
  • Harry is wondering where he'll have lunch when he runs into Ron and Hermione. Ron and Hermione finish their ice cream, then they and Harry go to one store, then they go back to the Leaky Cauldron and it's time for dinner.
  • Mrs Weasley complains that Fred and George have not been made prefects. However, as only one male Gryffindor prefect would have been chosen from their year, it would have been impossible for both of them to be prefects.
    • It is possible that Mrs Weasley simply hoped that one of the twins would be made a prefect.
  • Mr Weasley says that Ron and Harry have ended up in the Forbidden Forest twice, but only Harry has ended up in the forest twice. Ron's first time into the forest was when he went with Harry to see Aragog in their second year, but in their first year, only Harry went into the forest for his detention; Ron was not there (he is in the film but not in the book). This error was corrected in later editions.
  • From Mr Weasley's conversation at the Leaky Cauldron, Sirius had known that Pettigrew was alive and hiding at Hogwarts for several days. But in the Shrieking Shack in chapter 19, Sirius says that he first learned about it the night Fudge visited Azkaban. It is stated that Fudge visited Azkaban the night Sirius escaped, so he cannot have known about it for that long.
    • It is possible that Sirius may have been referring to someone else, perhaps Harry or Voldemort. Sirius would know that Harry is at Hogwarts by the time that he is reported to start talking in his sleep and he might have heard about the Chamber of Secrets incident when Hagrid was imprisoned here.
    • Sirius said Fudge came to inspect Azkaban the night he found out about Pettigrew, which implies it was a routine visit (Fudge gave Sirius his copy of the Daily Prophet, so this was before he escaped); it is possible that Fudge re-visited Azkaban due to Sirius's escape. Sirius also said that his escape happened 'one night' after he found out about Pettigrew, again implying that these were separate visits.

Chapter 5: The Dementor[]

  • Harry tells Arthur Weasley that overhearing his conversation with Molly Weasley the previous night meant that Arthur had not broken his word to Fudge, but Arthur never mentions giving Fudge or anyone else his word that he would not tell Harry about Sirius Black being after him. What he said when Harry overheard him was that he'd tried to convince Fudge that Harry needed to know, and that Fudge wanted it kept a secret (presumably from the public), neither of which are the same as Arthur promising not to tell Harry about it.
  • When Harry, Ron, and Hermione first find a carriage, and have stowed their luggage, they return to the platform to say goodbye to Mr and Mrs Weasley. Upon reentering the train, it is said that the three of them set off looking for an empty compartment and end up finding one at the very end of the train. Since the trio had already stowed their luggage earlier, there would be no need for them to go looking for an empty compartment. However, after Harry explains his situation with Sirius, it's revealed that Harry's Sneakoscope is in his trunk on the rack above them.
  • Why is the "Professor" on Lupin's suitcase old and peeling, when he had only become one in the previous month or so?
  • 1 September in 1993 was the night of a full moon. Therefore, Lupin should not have been on the train, considering how later in the book he is unable to teach for the three days around the full moon.
  • When the Hogwarts Express slows down due to being boarded by Dementors, Hermione checks the time and notes solely from it that they couldn't be at Hogwarts yet; however, shortly after the train got underway again, Lupin said that they were only ten minutes away. The train leaves King's Cross at 11am, and it is nighttime by the time it reaches Hogwarts; given that sunset around Hogwarts would have been gone 8pm,[14] the journey would have taken over 9 hours at the very least, and most likely 10-11 hours. On that timescale, being ten minutes away means they were in fact very nearly there, just as Ron thought. The windows were also noted to have slowly darkened due to nightfall, to the point of being 'completely black' by the time the boarding occurred, further suggesting that they were indeed nearing Hogwarts. Yet, Hermione's reaction on seeing the time suggests their ETA was a lot more than ten minutes; these occurrences simply don't add up.
    • The train could have sped up after getting underway again, to compensate for the delay.
    • It is also possible that the train has a very specific departure and arrival schedule, to the point that even 10-15 minutes would be a significant deviation, and that Hermione was going by that.
  • This is supposedly Harry's first encounter with the apparently-horseless carriages that take non-first-years from the station to Hogwarts. How did he get from Hogwarts back to the station at the end of his second year? (In Harry Potter and the Philosopher's Stone we see that first-years take the boats back at the end of the year.)

Chapter 6: Talons and Tea Leaves[]

  • Hermione's Time-Turner is a major secret that supposedly took a lot of persuasion to obtain. However, the reason it was necessary should not have been an out-of-place occurrence: any Gryffindor taking the Study of Ancient Runes would need to use one to attend their Friday Charms class that happens at the same time. Likewise, any Gryffindor who takes any combination of Divination, Muggle Studies, and Ancient Runes would require a Time-Turner since all of those classes occur at the same time on Wednesday mornings.
    • However, one solution is that Hermione's case was an unusual one: perhaps most students would be told that they could not take those classes together in one year, but she persisted in asking for them. Alternatively, the timetable may have been reshuffled in past years when students wished to take conflicting classes, or be put into classes with other houses to ensure attendance. A student taking all of the classes, however, would render these fixes moot and require alternative methods, such as the Time-Turner.
  • All of the named Gryffindor third-years are in the first Divination class. So who else is in Hermione's Arithmancy and Muggle Studies classes?
  • Hermione was never out of Harry and Ron's company for their entire first morning, but she apparently managed to use the Time-Turner to get to her other classes.
  • On page 101 of the US hardcover edition, Sybill Trelawney's name is misspelled as "Sibyll."
  • Trelawney tells Lavender, "Incidentally, that thing you are dreading- it will happen Friday the sixteenth of October." In 1993, when this happens, 16 October was a Saturday.
  • After Neville breaks his pink teacup, Trelawney asks Neville to get a blue one to replace it, as she likes the pink ones. She then proceeds to sweep up the shards of the first teacup with a feather duster and dust pan. It is unclear why she couldn't simply use a Reparo charm to fix the first cup.
    • It's possible that she was just being theatrical, which is something she's known for.

Chapter 7: The Boggart in the Wardrobe[]

  • One would think the boggart would have turned into Voldemort for many of the students, considering that most of them are afraid to even say his name.
  • In fact, Lupin prevents Harry from confronting the boggart because he thinks it would take the form of Voldemort and people would panic, when they hadn't been panicking when confronted with their own supposed worst fears. (Which is a somewhat startling thing for a teacher to ask a class to reveal about themselves on the first day!)

Chapter 8: Flight of the Fat Lady[]

  • On page 117 of the UK paperback edition, when Harry is talking to Lupin about the Boggart and he mentions Voldemort, it says "The only person Harry had ever heard say the name aloud (apart from himself) was Professor Dumbledore" But in the Philosopher's Stone, Hagrid says, "Nah - can't spell it. All right - Voldemort." Although, Harry may have excluded Hagrid as he does not use the name habitually. Hagrid also whispered it only begrudgingly.

Chapter 9: Grim Defeat[]

  • During his substitution of the Defence Against the Dark Arts class, Snape says "That is the second time you have spoken out of turn, Miss Granger", but actually it is the third time she speaks out of turn. Although, Snape may have not counted the first time.

Chapter 10: The Marauder's Map[]

  • When describing the Fidelius Charm (with the scenario of Voldemort not knowing the secret), Flitwick says Voldemort wouldn't find the Potters even if he pressed his nose on the Potter cottage's sitting room window. As the cottage was under the Fidelius Charm (it is strongly implied to have been in Harry Potter and the Deathly Hallows), it would have been invisible to all but those who knew of the secret (as evidenced in Harry Potter and the Order of the Phoenix). Therefore, Voldemort wouldn't have been able to even see the sitting room window (or any other part of the cottage), let alone press his nose against it.
    • Flitwick could have meant that figuratively rather than literally.
    • Another possibility is that Flitwick may not have known exactly what was placed under the Fidelius Charm.
  • The name 'Marauder's Map' is grammatically incorrect, as it was presumably intended to be a reference to the group who called themselves the Marauders (who created it); the position of the apostrophe means there's only one Marauder. The gramatically correct name is therefore 'Marauders' Map', with the apostrophe coming after the letter 's', not before.
    • It is possible, though unlikely, that the name 'Marauder' was meant as a title for one who used the map.
    • It should also be noted that the group was only named the Marauders retroactively; the first on-page usage of the term doesn't come until Harry Potter and the Half-Blood Prince.
  • When Harry overhears the conversation at the Three Broomsticks where he learns that Sirius Black supposedly betrayed his parents, Hagrid appears not to have known about it, and he was closely involved in the events at the time. Whereas Lucius Malfoy clearly knew it, because Draco did. (Actually, Lucius almost certainly knew that it wasn't Black.)
  • It is also carefully never mentioned that Lupin was a close friend of James and Sirius, along with Pettigrew.
    • It is possible that nobody thought it was relevant to the topic of the discussion, namely Sirius' supposed betrayal of the Potters.
  • The Three Broomsticks was described as crowded and busy, yet Madam Rosmerta had time to sit down for a twenty-minute conversation with Fudge et al.
    • It is likely that she had some assistants.
  • It seems strange that it was the Magical Law Enforcement Patrol rather than Aurors who arrested Sirius Black, given that he was supposedly a dangerous Voldemort supporter and his most devoted servant.
    • It is possible that these revelations and the one that he was supposedly the Potters' Secret Keeper came afterwards (indeed, eyewitnesses told officials about Sirius's supposed betrayal of the Potters presumably after he was arrested), meaning that, at the time, his supposed crime (blowing up the street, killing thirteen people) was likely in the purview of the general law enforcement patrol.
  • Fudge says that only Hit Wizards would stand a chance against Black, but surely Aurors would too.
  • Why didn't Sirius tell Hagrid about the change of Secret Keeper? It is revealed here that Hagrid did not know at the time that Sirius was apparently the Secret Keeper, and what we hear of his behaviour supports this, so he would presumably have been more open to hearing (and believing) Sirius's explanation than those who did know. In fact, even if Hagrid had known, Sirius could still have told him about the switch instead of keeping quiet about it and just letting those who thought that he was the Secret Keeper continue to believe that he had betrayed Lily and James. If Sirius knew the Memory extraction spell, he could even have given Hagrid his memories to give to Dumbledore. Sirius must have known what it looked like as soon as he arrived at Godric's Hollow.
    • It's possible that Sirius was too shocked and upset to think of doing so.

Chapter 11: The Firebolt[]

  • Harry suggests that Hagrid call him, Ron and Hermione as witnesses before the Committee for the Disposal of Dangerous Creatures, but he never does so, and they never remind him of this.
  • Remus Lupin tells Harry that the reason why the Dementors affect him so badly is because there are horrors in his past that the others don't have. However, given the extent of Voldemort's reign of terror during the First Wizarding War, it's highly likely that other students lost friends or relatives to his cause as well, so they should also be especially susceptible. In particular, Neville's parents were tortured into insanity, yet he's never mentioned to be as affected as Harry. It also seems somewhat inconsistent that the memory of his parents being killed is enough for him to be affected so much by the Dementors, but isn't enough for him to yet be able to see Thestrals.
    • One theory is that Harry's susceptibility is due to the piece of Voldemort's soul inside him in addition to his own soul making him an especially desirable target to the Dementors.
    • It is likely that Harry, given that he was the actual target of the 1981 Attack at Godric's Hollow, was the only one to have actually been there when it happened; therefore, Harry would be the only one to have an actual memory of such an event to relive when near a Dementor. There is no reason to assume that Neville was present for the Attack on Frank and Alice Longbottom (in fact, it is likely he wasn't, or he would likely have been attacked too); therefore, Neville, unlike Harry, would have no memory of the attack to relive, and the same is presumably true for others. Even if they remembered being given news of such an event, it wouldn't have been nearly as traumatic as actually being there and experiencing it first-hand.
  • Given that Lupin had a transformation after Hallowe'en but before the following weekend, the full moon would have had to be sometime in the first week of November. Since a full moon occurs every month or so, the December and January full moons would also have occurred sometime around the first week of those months. Therefore, a full moon during the Christmas period is not possible. Yet, Dumbledore explains to Trelawney that Lupin's absence from the Christmas dinner is that he is not well again; implying either a transformation or post-transformation exhaustion, especially since Snape is mentioned as having brewed his potion for him.

Chapter 12: The Patronus[]

  • Lupin is surprised that Harry is familiar with butterbeer, and Harry has to quickly come up with a cover story to avoid revealing that he's been in the Three Broomsticks. But in the rest of the series, butterbeer appears to be available everywhere in the Wizarding world.
  • When Harry gets back into the Gryffindor common room with his Firebolt given back to him after being tested for jinxes, the common room admires the broom. An unidentified Gryffindor tells Harry, "Ravenclaw'll have no chance, they're all on Cleansweep Sevens!" However, later in the book, Oliver Wood tells Harry that Cho Chang, the Ravenclaw Seeker, rides a Comet 260.
    • It is possible that the unidentified Gryffindor who told Harry this only meant that most of the Ravenclaws ride Cleansweep Sevens. Or, it could be due to the fact that they didn't know the Ravenclaw team's line-up before the match, so they just generalised from what they had seen in previous games.
    • It is also possible that she switched brooms.

Chapter 14: Snape's Grudge[]

  • On page 285 of some versions of the US hardback edition, Snape's name is misspelled as "Snap".
  • It seems unfair on Sir Cadogan that he was sacked after letting Sirius Black into Gryffindor Tower, even though he had the passwords; earlier in the book, Dumbledore says that the Fat Lady refused to let him in without the password, which implies that she would have let him in if he did have it. For all of his eccentricity, Cadogan's security of the tower was much more rigorous than the Fat Lady's, with his extremely complicated passwords and the fact he changed them frequently, and it was through no fault of his that Sirius had obtained them.
  • It is likely that there was an outright ban on Sirius being granted entry into Gryffindor Tower, but then, why did Dumbledore (or McGonagall in the previous chapter) mention the password in relation to him being let in or attempting to get in?
  • It is also possible that he was blamed for the break-in, for giving Neville the passwords in the first place. However, in the previous chapter, McGonagall was furious, not because they had been given to a Gryffindor student, but because they had been left lying around.
  • McGonagall forbade anyone from giving Neville Longbottom the password to Gryffindor Tower, and this is stated to have meant that he was forced to wait for someone to let him in every night. However, this is a paradox: anyone letting him in would have to speak the password in front of him, thereby giving him the password; therefore, that very act goes against McGonagall's orders not to give him the password, nor would Neville have had to wait to be let in every night. It is unlikely that there were multiple passwords, as the word 'password' is used in its singular form.
    • It is possible that Neville was sent out of earshot whenever someone was there to let him in, so they could speak the password without him hearing it, but this seems a rather cumbersome way of letting him in without giving him the password.
    • It is also possible that this was meant to mean that someone inside the common room would open the portrait hole to let him in. However, this would surely present security concerns: anyone could be let in like this (even with the security trolls there), and it would pretty much defeat the purpose of the password.

Chapter 15: The Quidditch Final[]

  • When Hermione realised that she had missed her Cheering Charms lesson, it is unknown why she didn't simply use the Time Turner to go back and make it to the lesson. The Time Turner can go backwards in time up to five hours. Charms was immediately before lunch, and Harry & Ron confronted Hermione about the missed lesson immediately after lunch, so she was well within the 5 hour time limit.
    • Of course, according to the rules of time travel that will be established in this book's climax, everything that happens to the time traveller also happened in the original timeline. This means that, if Hermione had used the Time Turner in this instance, then from Harry and Ron's perspective, she would always have been at the Charms lesson, meaning that Harry and Ron would not have had any reason to confront her about missing the lesson, meaning she would not have had the reminder to use the Time Turner in the first place.
  • When Katie Bell is taking her second penalty shot, it says she put it past the Slytherin Seeker (Draco Malfoy), instead of the Keeper.
    • This error is corrected in later editions.

Chapter 16: Professor Trelawney's Prediction[]

  • This chapter takes place in June 1994. Harry Potter reads a note from Hagrid and says, 'Buckbeak's appeal — it's set for the sixth.' The night after the Hippogriff's appeal, Remus Lupin is forced into a werewolf form by the full moon, which means that this happened on the night of 6 June 1994. The web page HP-Lexicon.org also backs this up. However, a brief look at lunar phase calendar sites such as 1994 and lunar phases in 1994 definitely shows 9 June 1994, as a new-moon night, which means that a full moon could not possibly rise three days earlier.
    • In addition, during that Christmas's luncheon, Dumbledore, when asked by Harry about Lupin not lunching with them, explicitly states that 'the poor fellow is ill again', alluding to a possible full moon the night before. This is impossible, however, if June's full moon rose on the 6th, as a lunar cycle is 29.5 days long (requires verification).
      • While it is possible that like dates and days not matching up in the Harry Potter universe to the real world, J.K. Rowling slightly adjusted the moon's phases to fit the story, it is highly unlikely that she made the lunar cycle shorter, as this would have major consequences on the tides, with likely catastrophic results.
      • It is also possible that Lupin had caught the flu, or any other - curable - disease. Again, this is highly unlikely, as Dumbledore states that he is ill again, indicating a similar incident having happened before.
  • Before Harry and Hermione go back in time, it mentions that Buckbeak is tied to a tree. But when they go back in time, Buckbeak is tied to a fence. This error was fixed in later editions of the same book.
  • When Dumbledore and Fudge head towards Hagrid's hut, Dumbledore's beard is stated to be gleaming in the sunlight. However, just a little earlier on, when the trio went to the hut, the sun was said to be sinking behind the Forbidden Forest. Wouldn't the trees therefore be blocking the sunlight?
    • It's possible that there were gaps through which sunlight was penetrating.
  • After the trio leave Hagrid's hut, there was a ruby-red glow to the west, meaning that was where the sun had set. However, at that latitude and time of year, the sun sets towards the northwest. Although it is commonly said that the sun sets in the west and rises in the east, that is an oversimplification; it is only around the equinoxes that the sun sets precisely around the west and rises around the east.
  • Hagrid seems to suggest that Harry would be in serious trouble with Cornelius Fudge should he catch him out after hours. However, in Harry Potter and the Order of the Phoenix, it is stated that the Ministry has no power to punish Hogwarts students for breaking school rules.
    • It is, however, possible that Hagrid only mentioned Fudge because he knew Fudge would be coming to his hut.

Chapter 17: Cat, Rat and Dog[]

  • It says "Ron crawled to the four-poster and collapsed onto it". But when Professor Lupin comes in, it says "his eyes flickered over Ron, lying on the floor". This could not be, as Ron should still be on the bed. Crookshanks was on the bed, and 'on the floor beside him.... was Ron' Ron moves from this position to 'protect' Harry. 'If you want to kill Harry, you'll have to kill us too' at this point he is standing, 'clinging painfully to Harry to stay upright'.
  • Sirius completely behaves like the villain he's been portrayed as for the entire book right up until Lupin shows up. This is not a mistake per se, but is a ridiculously blatant contrivance. Particularly when Harry accuses him of killing Harry's parents and he responds with "I don't deny it".
  • Further, it strains credulity that everyone, including Lupin and Dumbledore, is perfectly well convinced that Black was secretly a high-ranking Death Eater and that he betrayed the Potters, when right up to that point he was James's bosom friend. Particularly, why does everyone believe Black was Voldemort's "second-in-command"?
  • When Lupin tells Harry, Ron and Hermione that the Marauder's Map showed that someone was with them when they left Hagrid's hut, they argued that no one was. However, they knew that Scabbers was with them, and Harry already knows that the map shows animals, since among the characters he sees in the map when he first looks at it is Mrs Norris the cat.

Chapter 18: Moony, Wormtail, Padfoot and Prongs[]

  • It must have seemed strange to the residents of Hogsmeade that someone would go and build a brand-new run-down haunted house.
  • Also strange that it's still called "the most haunted house in Britain", when it was only "haunted" for 7 years and not a peep has been heard from it in many years. (It is of course possible that some actual ghosts moved in for a while.)
    • Lupin does acknowledge that the house has been silent for years, but also notes that the villagers are still too scared to approach it. It is possible that "the most haunted house in Britain" refers to this reputation.
    • Dumbledore himself encouraged the rumour that the place was haunted, which would of course have given it a huge amount of credence.
  • Lupin says that the four of them wrote the Marauder's Map from the knowledge of the Hogwarts grounds and Hogsmeade they gained on their nighttime, er, marauding. But the map includes the floor plan of the castle, which presumably they didn't go into at those times, and doesn't include Hogsmeade at all. (Undoubtedly they also explored the castle pretty thoroughly on other occasions.)

Chapter 19: The Servant of Lord Voldemort[]

  • Snape says in the Shrieking Shack that Lupin had not taken his potion that night, but it is explained that one must drink the Wolfsbane Potion the week before transforming, not on the night itself.
    • It may be that the potion must be continually consumed before the full moon to be effective, rather than just once the week before.
  • Peter Pettigrew, a mediocre-at-best wizard by all accounts, managed to cast a spell that killed 12 people and blasted a huge crater in the street. We never hear of anyone else, even Voldemort, casting a spell that powerful, at least in terms of the damage caused.
  • Sirius says that Crookshanks stole the passwords to Gryffindor Tower, and that's how he carried out his attempt on Scabbers/Pettigrew. But this was after Pettigrew faked his own death (again) and framed Crookshanks for it, and Crookshanks has to have known about that. (Admittedly, it was only a day or so later, but Harry sees Crookshanks in the grounds the night before Sirius's attack, and it's strongly implied that he had a glimpse of "the Grim", i.e. Sirius, with him.)
  • During the climax, it is explained that it was Wormtail, not Sirius, who was the Potters' Secret Keeper and, therefore, traitor. In Chapter 21, Dumbledore confesses that he gave evidence that Sirius was the secret-keeper, and witnesses are only allowed to give evidence if it is something they have personal knowledge of. So he should have known from the beginning that it was Wormtail, not Sirius, who betrayed the Potters.
    • However, it is possible that a Secret Keeper is themself secret; with Sirius claiming the role as the most obvious choice and decoy from Pettigrew, only those told the secret would know who the Secret Keeper for the secret was. As it is, we don't know enough about how the spell works and its rules.
    • It is likely that the evidence Dumbledore gave was his knowledge of the Potters' intent to use Sirius as Secret Keeper, and as the switch was kept secret, that would have been considered sufficient proof from his and others' points of view in the circumstances, as no-one had any reason to believe that Sirius was not in fact the Secret Keeper.
  • Sirius says that he persuaded James and Lily to use Peter as Secret Keeper instead of him, thinking that Voldemort would try to coerce the secret out of him. However, the whole point of the Fidelius Charm is that the Secret Keeper cannot be coerced into revealing their secret and can only do so willingly, and as he was so adamant that he would never have betrayed the Potters, his ruse was entirely unnecessary.
  • Sirius Black says that Voldemort has been in hiding for fifteen years. He's actually been in hiding for twelve years (almost thirteen at the time that he says it), about the same amount of time since Black was imprisoned. Voldemort went into hiding right after he was ripped from his body after failing to kill Harry. Of course, Black could just be rounding off to an approximated number (fifteen years), but this seems unlikely since he keeps talking about being in Azkaban for twelve years, being that the two time frames are almost exactly the same. Sirius also says to Pettigrew, 'you haven't been hiding from me for twelve years, you've been hiding from Voldemort's old supporters'.
    • This is corrected in later editions.
  • We see in Harry Potter and the Goblet of Fire that Pettigrew was a full Death Eater. This means that Snape, as a fellow Death Eater, should have known that Pettigrew was spying for Voldemort. Why did he not warn Dumbledore of this? Particularly as he knew Pettigrew was close to Lily? (It is conceivable that Voldemort gave Pettigrew his Dark Mark at some point after Pettigrew found him in Albania, but both here and in Harry Potter and the Goblet of Fire it really appears that he had been one all along.)
    • It is also shown in Harry Potter and the Goblet of Fire that when all Death Eaters are summoned to Voldemort, they all come hooded and masked, presumably to conceal their identities. That way, if one was captured, they couldn't reveal the identities of all the others and compromise the entire organisation. It is therefore entirely possible that Snape indeed had no idea that Peter Pettigrew was a Death Eater. This also explains how, despite many Death Eaters (including the likes of Bellatrix Lestrange) getting captured by the Ministry, many others were able to evade exposure as Death Eaters, for it is unlikely that all Death Eaters were able to resist Legilimency and Veritaserum via Occlumency.
    • This is also stated by Igor Karkaroff in his hearing in Harry Potter and the Goblet of Fire, but in the graveyard scene in that book, Voldemort identifies several of the Death Eaters by name, indicating that he, at least, did not consider it important that the Death Eaters not know each other's identities. And, in Harry Potter and the Order of the Phoenix, Lucius Malfoy clearly knows the identity of everyone on his team.
  • In the UK audiobook edition, Snape almost hisses the word 'SILENCE!', even though it couldn't be more obvious that he was yelling.

Chapter 20: The Dementors' Kiss[]

  • When Lupin, Pettigrew and Ron are tied together, they are described as 'looking like contestants in a six-legged race', but it would actually be a four-legged race, as each pair of bound legs counts as one leg.
  • In the US paperback edition, when exiting the tunnel that lead out of the Whomping Willow, the group was in the following order: Crookshanks, Lupin, Pettigrew, Ron, Snape, Sirius, Harry, and Hermione. Later, when Hermione uses the Time-Turner, Harry and Hermione see themselves coming out in the order: Lupin, Ron, Pettigrew, Hermione, Snape, Harry, and Sirius.
    • This is corrected in later editions of the book.
  • The grounds are described as 'very dark'. However, at that latitude and time of year, the sky never gets darker than nautical twilight, meaning there would still have been a moderate amount of light in the sky; it certainly would not have been dark enough for the only light to have come from the castle's windows. Although a cloud moved, the sky is unlikely to have been covered in clouds, as the group are described to have been bathed in moonlight.
  • Lupin doesn't transform until the moonlight hits him. Which would imply lycanthropy is actually a rather easy condition to deal with; just stay inside with the shades closed.

Chapter 21: Hermione's Secret[]

  • Dumbledore is resigned to the fact that Snape's version of the events of the night of Sirius's recapture is far more convincing than the truth; why did it not occur to him for Harry or Hermione to show Fudge their memories of their Encounter at the Shrieking Shack, which would have proved Sirius's innocence? Even if Harry and Hermione did not know the memory extraction spell, surely Dumbledore could have done it for them?
    • It is possible that Fudge would simply have claimed that Sirius had modified their memories to make them believe that he was innocent. Indeed, that is almost exactly what Snape claimed when he told Fudge of the trio's willingness to hear Sirius and Remus out. However, that does not seem a sufficient reason not to at least try to convince Fudge that way.
  • On page 287 of the UK paperback edition, Dumbledore is speaking to Harry and Hermione and tells them, "There is not a shred of proof to support Black's story, except your word – and the word of two thirteen-year-old wizards will not convince anybody," but Hermione's birthday is in September, so she's 14 years old at this point. However, this may not be considered a mistake, as it could be explained simply by Dumbledore not remembering Hermione's birthday.
  • Sirius was presumably sent to Azkaban without a trial on charges of being a Death Eater. However, in this chapter, while explaining the situation to Harry and Hermione, Dumbledore states that he gave evidence that Sirius was the Potters' Secret-Keeper. This would imply that there was at least some kind of trial. Sirius may not have been allowed to give evidence in his defence, but there would still have been a trial in the first instance, even if it was entirely ex parte.
    • A possible explanation is that Sirius's imprisonment (for the alleged murder of Peter Pettigrew and several Muggles) and the investigation of the Potters' deaths and the disappearance of Voldemort were two separate cases. In the first case, he was the main participant, with a number of testimonies confirming his guilt (mass murder and magic in front of Muggles). In the second case, Sirius was only one of the participants, and the purpose of this investigation was to find out the circumstances of the Potters' death, Voldemort's disappearance and to confirm that he had indeed disappeared. Dumbledore's testimony was given in connection with this case and was not related to the circumstances of Sirius's arrest and subsequent imprisonment in Azkaban.
  • When Harry and Hermione leave from the hospital wing using the Time-Turner, Dumbledore says it is ten minutes until midnight, but on the way back to the ward after they rescue Sirius, they hear Dumbledore say to the other versions of them that it is five minutes to midnight.
    • Corrected in later editions, making Dumbledore say "five minutes to midnight" the first time, instead of ten.
  • It's not stated, but presumably Harry, Hermione, or Sirius shut the window to Flitwick's office before going to the tower. Otherwise, it would have been pretty obvious how Sirius escaped. Given that Snape and Fudge argue about it the following chapter, it apparently wasn't; Fudge even thought that Sirius must have Disapparated. What's more, it seems implausible that Fudge wouldn't know about Apparition being impossible within Hogwarts.

Chapter 22: Owl Post Again[]

  • In June, Fred and George Weasley find out they have scraped "a few O.W.L.s apiece." However, in subsequent books, it is firmly established that O.W.L. results are sent home by owl and are not received until July.
    • It is possible that those results were delayed due to the outbreak of the Second Wizarding War, although this is unlikely, as Professor McGonagall said that they would be receiving their results by owl.
    • Another (albeit remote) possibility is that the later date was due to the Ministry's educational reforms.
  • When Lupin was taking the Wolfsbane Potion earlier in the book, he was apparently transformed for a couple of days, but in this case he transformed sometime before midnight and was back to normal the next morning.
  • How did Sirius know that Harry didn't have permission to visit Hogsmeade?
    • It is possible that Crookshanks told him, though exactly how is a mystery, given that Crookshanks cannot communicate the way humans do.
    • Is it also possible that, as Sirius saw Harry running away from 4 Privet Drive in fury, he presumed that the Dursleys did not sign the Hogsmeade permission form.
    • Another, stronger possibility is that Dumbledore told him after he found out about his innocence.
  • Weren't Quality Quidditch Supplies or whomever Sirius got Harry his Firebolt from at all suspicious about the discrepancy in the order between the recipient and the owner of the vault? Or the fact that the vault belonged to Sirius? (even if they didn't know this, Gringotts would have) For that matter, did they not carry out any checks to ensure the order came from the owner of the vault? Either they did not, or everyone was okay with Sirius taking money out of his vault when he was on the run and the whole country was after him. Could anyone just place an order using money from someone else's vault?
  • On page 311 of some editions, it said "Dumblefore" instead of "Dumbledore". This typographic error was rectified in later editions.
  • When Harry receives Sirius's letter, he shouts that it's from him. Ron and Hermione even excitedly tell him to read it aloud, which he does. Harry is lucky no one heard them, or they would know that Sirius is an acquaintance of his, which would have led to awkward questions. In the next book, the trio make sure that they are not overheard when talking about him, to prevent exactly that.
    • Maybe the Hogwarts Express compartment doors are soundproof?

Harry Potter and the Goblet of Fire[]

  • In the early printings of the Scholastic edition, there are some books which were bound incorrectly, the spine and cover having been bound inverted. Upon opening, one notices that the text seems inverted, that the first page ones sees is really the last of the book.
  • 1 September 1994 was Sunday in the book but if 30 October 1994 was Friday, then 1 September would have to be Tuesday if you counted from that day to the 30 October. The book not only states 1 September was Sunday, but that the 2 September was Monday and that three days later on Thursday, Harry attended Defence Against the Dark Arts when in logically it would be Tuesday 1, Wednesday 2 and Saturday 5 September. The only way it could work is if both September and October were only exactly 4 weeks (or 28 days) long.

Chapter 1: The Riddle House[]

  • In the American version, there are repeated references to a planned murder, with lines such as "... one more death and our path to Harry Potter is clear" and "One more murder… my faithful servant at Hogwarts…" Yet, there is no indication that anyone else is murdered that was part of this plan. Bertha Jorkins was already dead, Frank Bryce was only a victim of circumstance, and Barty Crouch was originally kept alive and only killed because he had escaped and become a liability.
    • The British version specifically said curse; not murder. This was also corrected to "curse" in later printings of the American versions.

Chapter 2: The Scar[]

  • The narration mentions at one point that Harry "had only found out that Sirius was his godfather two months ago," when in fact it had been on the December Hogsmeade trip (in other words, eight months ago) when Harry overheard that Sirius was his godfather. It would be more accurate to say he "had only found out that Sirius was innocent two months ago".
    • Additionally, on the same page, Harry mentions that he had met Pettigrew "the previous year" rather than "two months ago", though it is likely that referred to school year rather than calendar year (which would mean that the 1994–1995 school year was treated as the current year, even though it hadn't actually begun yet).
  • In the letter Harry writes to Sirius he mentions Dudley throwing his PlayStation out the window; however the PlayStation wasn't released until December 1994 in Japan and September 1995 in Europe.
    • Regarding that, J. K. Rowling has stated "I can't work PlayStations. I'm no good at these things."
    • One in-universe explanation is that Dudley's parents may have bought one of the earlier available PlayStation prototypes designed for game designers, some of which were known to have been sold to private consumers. Alternatively, the PlayStation may have been released earlier in the Harry Potter universe, or Harry, due to his lack of interest in Muggle technology, might have confused the PlayStation with a similar console.
  • Harry's recollection of the dream suggests that he saw some of the events from Frank Bryce's perspective. This is only possible if Voldemort was possessing or inhabiting Bryce (it is revealed in the next book that these dreams and visions are due to the soul link between Harry and Voldemort), yet there is no indication in the previous chapter whatsoever that he was, nor is it at all clear what reason he might have for doing so.

Chapter 3: The Invitation[]

  • Molly Weasley says in her letter to the Dursleys that Britain hasn't hosted the Quidditch World Cup for 30 years, but Quidditch Through the Ages states that the tournament is held every four years, and 30 isn't divisible by four.

Chapter 4: Back to The Burrow[]

  • The Weasleys are surprised by the Dursleys' boarded-up fireplace, but in Harry Potter and the Philosopher's Stone and Harry Potter and the Order of the Phoenix, the Dursleys have an apparently-functional fireplace in the kitchen.
  • Mr Weasley puts a pinch of Floo Powder into the fire for their group to return to The Burrow, but in Chamber of Secrets everyone has to use Floo Powder individually to travel.
  • Mr Weasley uses magic to deflect something that Vernon Dursley has thrown at him. In The Chamber of Secrets, Harry receives a warning from the Ministry of Magic for using magic in the presence of Muggles and also because he is underage and away from Hogwarts, even though it was Dobby who used magic, not Harry. We later learn that this is because the Ministry doesn't know when a specific wizard uses magic, but rather, where it is used. Since the Ministry knows Harry is the only wizard living in that general area, any magic performed is assumed to come from Harry. So why wouldn't Harry have received a letter after Mr Weasley performed magic in the Dursleys' home?
    • Mr Weasley presumably notified the Ministry that he was going there, so they couldn't just assume it was Harry.

Chapter 5: Weasley's Wizard Wheezes[]

  • While cooking, Mrs Weasley pours a creamy sauce from her wand. This breaks Gamp's Law of Elemental Transfiguration, which states that food cannot be created by magic. This could be explained as that Mrs Weasley is Summoning the sauce rather than conjuring it from nowhere.
  • After Hermione stops Ron from talking about Sirius Black in front of Ginny, it is stated that the only people who knew about his innocence are the trio and Albus Dumbledore, but Remus Lupin also knew and the trio knew that. It is also stated that Ron helped Sirius escape, even though he was in fact in the Hospital Wing recovering and was thus unable to accompany Harry and Hermione in the Rescue of Sirius Black and Buckbeak.
  • How did Ron explain having Pigwidgeon to his family? Surely they were curious as to how Ron had obtained him? He can't have told them the truth (that he was given him by Sirius), as that would have taken a good deal of explaining, and it is made clear here that none of the rest of the family knows the truth about Sirius.
    • There's a chance that Ron said he bought Pigwidgeon with pocket money he saved over the years; when he's as the Quidditch World Cup Campsite, he says he's been saving pocket money all summer. The quantity he saved is implied to be at least ten Galleons. Supporting this hypothesis is the fact that, in the previous book, Hermione also had ten galleons, and was going to buy an owl with that money before getting Crookshanks instead, which strongly implies that ten galleons is enough for one. Sirius also expressed doubts about Pigwidgeon's reliability, so it can also be assumed that he was rather cheap.

Chapter 6: The Portkey[]

  • Mr Weasley cites Diagon Alley and Platform Nine and Three-Quarters as two places that Muggles cannot penetrate. However, neither of these are truly Muggle-proof. In Deathly Hallows, during the chapter "The Prince's Tale," it is shown that Lily Evans's parents and sister were able to enter Platform Nine and Three-Quarters. Also, in Chamber of Secrets, Hermione's parents are in Diagon Alley with their daughter, and in fact, Arthur Weasley even strikes up a conversation with them.
    • There might be some sort of allowance for Muggle-born children's parents to go to Diagon Alley and Platform 9 3/4
  • Fred asks Mrs Weasley why they cannot Apparate to the Quidditch World Cup, and she says that it is because they are not old enough and haven't taken their Apparition test, but in Harry Potter and the Half-Blood Prince Dumbledore takes Harry along with him to visit Horace Slughorn using side-along Apparition, and in later books the Ministry of Magic recommends side-along Apparition as a way for parents to escape from danger with their children.
    • One possibility is that side-along Apparition is riskier than normal Apparition (one is not only transporting oneself, after all), and should normally only be attempted in emergencies (which being attacked by Death Eaters would qualify as) or is otherwise not recommended for general use, and Dumbledore, being the world's greatest wizard, was an exception to this.

Chapter 7: Bagman and Crouch[]

  • When Fred and George bet on the Quidditch match with Bagman, it says George put the paper with their wagers in his robes, but George was wearing Muggle clothing.
  • When the Weasleys, Hermione and Harry arrive at the camp site for the Quidditch match, they have to use a map to find where they set up their camps. Yet Percy, Bill, and Charlie are able to find them right away after Apparating in the woods. This is proved by Percy saying, "Just Apparated, Dad" as soon as they emerged from the woods. It seems impossible that the three could have found their camps that quick, unless Mr Weasley had sent a message to his sons while collecting wood for their fire.
    • However, it is said that their camping spot was located right next to the main path, so Percy, Bill and Charlie may just have got lucky.
    • It is also possible that the three eldest children did in fact go to find a map, and Percy was referring to them Apparating a short while ago.
    • Since Percy is a very proud person who has just left Hogwarts, he may be simply bragging about his ability to Apparate, while his younger siblings cannot.

Chapter 8: The Quidditch World Cup[]

  • In Quidditch Through the Ages, it is stated that the first-ever World Cup was in 1473, with a tournament being held every four years. Yet, the World Cup in 1994 is number 422. There cannot be 422 World Cups in 521 years with a four-year gap in between. (A 422nd Cup in 1994 would mean a first Cup in 306, while a first Cup in 1473 would mean a 422nd Cup in 3161). Only 130 four-year periods fit in 521 years.
    • Even if a sufficient amount of "ghost years" were to be added or a sufficient number of Cups removed, that would still make a perfect sequence of Cups every four years in this period impossible because 1473 is an odd number and 1994 is an even number. However, the 1877 World Cup was restaged the following year due to no one remembering it, which explains this particular discrepancy.
    • Possible in-universe explanations are that the period of years in between Quidditch matches in the past may have been different or irregular, that the years may have been counted differently, or that there were unofficial Quidditch events before 1473 that, although not exactly World Cups, were counted as so.
  • Why didn't Arthur have Bill, Charlie and Percy Apparate straight back to The Burrow instead of taking a Portkey?

Chapter 9: The Dark Mark[]

  • Arthur Weasley says that the Dark Mark is a wizard's sign, and conjuring it requires a wand. The implication here seems to be that all wizard magic requires a wand, given that he also says that only a Death Eater (which Arthur is of course not) would know how it is conjured. Although this is corroborated by Voldemort later in the book when he says that any spell to help restore him to a body requires a wand (though the way it is phrased could mean that some spells do not require a wand), it contradicts the well-established existence of wizard wandless magic, including uncontrolled magic, which is usually wandless.
    • It is of course possible that Arthur was simply mistaken in his beliefs that wizard magic requires a wand (however, as he presumably had episodes of underage uncontrolled magic as a child, not to mention his children likely having had the same, he should have known full well that wizard magic does not necessarily require a wand) and that only Death Eaters know how to conjure the Dark Mark; in Harry Potter and the Half-Blood Prince, Horace Slughorn as good as admits that he knows how to conjure it, despite not being a Death Eater, and it is subtly suggested here in this very scene that Bartemius Crouch Senior, also a non-Death Eater, knows how to conjure it.
    • It is also possible that some spells cannot be performed wandlessly; however, if this is the case, it is unknown how Arthur would know that the Dark Mark is one of them.

Chapter 10: Mayhem at the Ministry[]

  • In the American paperback edition, on page 148, Harry asks Ron if he can dump his things upstairs in his room. It then states, "'What's up, Harry?' said Ron, the moment they had closed the door of the attic room behind them." In the Harry Potter and the Chamber of Secrets American paperback edition, on page 41, Ron says "... I'm right underneath the ghoul in the attic," referring to his room. Therefore, the sentence in Goblet of Fire where he closes the attic door (to his room) does not make sense because that is where the ghoul resides.
    • Although, with The Burrow being such a haphazard building, it is likely that it contains more than just one attic (an attic referring to a room beneath the eaves). Alternatively, attic rooms can have space between them and the roof, depending on the shape of the room. In such a case, Ron's room may be called the attic room and still have attic space above it - as it would all still be beneath the eaves.
    • It is also possible that, due to the familiarity with the ghoul, the Weasleys managed to move it into a different room over the course of two school years. An example that supports this would be Ron's plan for the ghoul to take up residence in his room while he was away searching for Horcruxes with Harry and Hermione.
  • How does Gringotts's fabled security work, if Molly was able to walk in there and take gold from Harry's vault? In Harry Potter and the Philosopher's Stone, Hagrid has Harry's key, but there's no mention of it here (or anywhere else) and it's clear Harry wasn't expecting her to make a withdrawal for him.
    • It's possible that, as Harry was underage, some people were authorised to manage his finances for him. As the Dursleys neither knew nor cared about the wizarding world, the witch or wizard in charge of his affairs (which, at various points in the series, is strongly implied to be Dumbledore) likely authorised her to take money out of his vault on his behalf, given that she is the closest thing to a mother Harry has ever known. The fact that she is allowed to act as his family and watch him at the Third Task later on in the book also supports this hypothesis.
  • Mrs Weasley, due to Ron's disapproval of his dress robes, suggests that Ron goes to the Yule Ball naked. However, Ron seems to have already said he'd rather do just that than put them on. Whether this is a mistake depends on the tone in which Mrs Weasley said for him to go naked, however, so it's difficult to tell from writing. In the UK audiobook edition, Mrs Weasley's tone of voice suggests that it's a new idea that she's introducing, making this a mistake.
    • It's possible that Ron's use of the word 'starkers' was intended to mean 'mad' rather than 'naked'. If this is the case, then that was not the best choice of word to use in this situation.

Chapter 11: Aboard the Hogwarts Express[]

  • Charlie Weasley states that half the cells in Azkaban are full thanks to Alastor Moody, yet only ten Death Eaters were freed during the breakout in Harry Potter and the Order of the Phoenix when the Dementors joined Voldemort. This suggests that Azkaban only has twenty or so cells (and that's assuming that each cell only holds one prisoner and that they were all captured by Moody, which is unlikely), which isn't many for any prison, let alone one like Azkaban.
    • It's possible that some Death Eaters had expired in Azkaban in the meantime, or that only the most valuable Death Eaters were released, though the latter seems unlikely.
    • It is also possible that he was not just referring to the First Wizarding War and its aftermath, though it is unclear what else he may have been referring to. However, the fact that he's retired suggests that he was pretty old, probably old enough to have been involved in the Global Wizarding War.
    • Charlie could have only been speaking metaphorically, as 'half' is often used colloquially to mean 'a significant proportion'. Still, ten cells hardly seems a significant proportion, especially for a prison like Azkaban.
  • Amos Diggory says that Alastor Moody, one of the greatest and most famous Aurors, has such a history of criminal offences that if the Improper Use of Magic Office get him for exploding dustbins, he would be in insurmountable trouble. But in the next book, Dolores Umbridge says that those whose criminal record is anything other than spotless are ineligible to become Aurors in the first place.
    • It is possible that, given the timeframe of Moody being an Auror, that the rules were less strict for him, what with the rise of Voldemort and the subsequent first wizarding war.
    • Another possibility is that Moody did whatever he did after his time as an Auror.
  • Amos Diggory seems to refer to the Misuse of Muggle Artefacts Office as Mr Weasley's department, in contrast to the Improper Use of Magic Office, but the Misuse of Muggle Arefacts Office is not a separate department; they are both offices within the Department of Magical Law Enforcement.
    • It is possible that Diggory was referring to the Misuse of Muggle Artefacts Office in contrast to his department, the Department for the Regulation and Control of Magical Creatures, which is a separate department. However, this seems unlikely, as exploding dustbins hardly seems to be within the purview of this department.
    • Is it also possible that the word 'department' here refers not to the Misuse of Muggle Artefacts Office itself, but rather to Mr Weasley's area of responsibility, which just so happens to be misuse of Muggle artefacts. This sense of the word also fits the context nicely.
  • Why didn't the Improper Use of Magic Office staff Apparate to the scene of the exploding dustbins? They can't have Apparated there, because there's simply no way Mr Weasley could have got there first if they had (indeed, the whole point of Amos Diggory alerting him is so that he could get there first, not to mention that they were already setting off when Amos Diggory appeared in the fire, so they had a huge head start over Mr Weasley), and Barty Crouch Jnr (who had been impersonating Moody from then) does not mention any Improper Use of Magic staff when he confessed under Veritaserum after being caught towards the end of the book, only Mr Weasley, and Apparition is presumably how Mr Weasley got there.
    • The only possible explanation is that none of them could Apparate, so they all had to use a much slower means of transportation. After all, Mr Weasley said earlier in the book that many wizards don't bother with Apparition and prefer flying. But even this seems somewhat unlikely.
  • Moody (actually Barty Crouch Jnr, unbenownst to anyone at this point) said he heard an intruder in his yard, creeping towards his house, and that they were ambushed by his dustbins, but to whom? And how? If Crouch's confession later is any indication, the Improper Use of Magic staff weren't there, and obviously Mr Weasley wasn't there yet. It can't have been Diggory either, as he only found out about the incident by chance. It is highly unlikely to have been the police who turned up, as he of course wouldn't mention something like dustbins ambushing people to them. During his confession under Veritaserum, Crouch says he said this to Mr Weasley, but that of course was after he arrived at the scene, whereas this was before.
    • Maybe Diggory, after finding out about the incident, somehow contacted Crouch-as-Moody (maybe they had a pair of two-way mirrors?), who then fed him the intruders-got-ambushed-by-the-dustbins story. However, there's nothing whatsoever to suggest this in Crouch's Veritaserum-induced recount of the Attack on Alastor Moody; he never mentions anyone other than Mr Weasley getting involved in any way.
  • Mr Weasley Disapparates wearing wizards' robes and carrying a cloak. This is a curious choice of attire to attend a scene in which he knew there may well be Muggles, for police were mentioned as having been there; indeed, earlier on, Mr Weasley donned Muggle attire when going to Quidditch World Cup, because he knew Muggles would be around.
    • Maybe he didn't Disapparate directly to the scene, but to the Ministry, or somewhere he kept Muggle clothing for these purposes. However, it is unclear just where this may be.
  • Draco Malfoy asks Ron if he'll enter the Triwizard Tournament. As the source for his information is the Minister for Magic, Cornelius Fudge, himself (albeit via Lucius Malfoy), it seems unlikely that he would not know about the age restriction, given that the Ministry was involved in the decision. It is clear that he was expecting Ron to know about the tournament being held, because of Arthur and Percy Weasley working at the Ministry, and seemed surprised that he did not.
    • It is possible, however, that he was simply looking for an opportunity to upset or jeer at him, and would have revealed it had Ron said yes; he seemed very pleased that he did not know, and delighted in rubbing it in.
  • The Triwizard Tournament being held at Hogwarts is classified information, which obviously had not yet been released, or Harry and co would have known about it, yet Molly, Bill, and Charlie Weasley were apparently allowed to know about it, despite none of them having anything to do with the Ministry or any of the schools involved.
    • Maybe Arthur or Percy (probably Arthur) bent this rule by telling them (just like Lucius Malfoy did with Draco), but didn't tell the younger Weasleys, Harry, and Hermione because they're the ones the rule was meant to keep the information from.

Chapter 12: The Triwizard Tournament[]

  • In the Scholastic Edition, in the 22nd line of the Sorting Hat's new song, Hufflepuff is spelt as "Hufflepujf."
    • This was fixed in later editions of the book.
  • Ron says that he supposes that they might want someone older than him for the Triwizard Tournament and expresses the possibility that they (fourth-years) haven't learnt enough, as if Dumbledore had not already made it crystal clear that only those who are of age (17) are permitted to enter and that they do not believe that anyone below sixth-year would be able to cope.
    • It's possible that Ron was referring to the impartial judge, later revealed to be the Goblet of Fire; Fred had said that it is the judge, not Dumbledore, that decides who the champions are, and that Dumbledore was merely trying to prevent underage students from submitting their names.

Chapter 13: Mad-Eye Moody[]

  • In the Daily Prophet article FURTHER MISTAKES AT THE MINISTRY OF MAGIC, Mr Weasley gets the blame for involving the Ministry in the incident regarding Alastor Moody's dustbins, causing great embarrassment to it, but earlier on in the book, it is made clear that the Improper Use of Magic Office were already aware of it and on their way to the scene before he was even informed.
    • Rita Skeeter was never one to let the facts get in the way of defaming those she dislikes.
    • It is also possible that she was simply unaware of this.
  • The article also says that Moody had raised a false alarm, which suggests that it was Crouch himself who raised it. But this makes no sense, as Crouch of course wouldn't have wanted the Ministry to know about it.
    • Unless the real Moody somehow managed to raise a genuine alarm before Crouch and Pettigrew succeeded in subduing him, and Crouch then made it look like a false one?

Chapter 14: The Unforgivable Curses[]

  • Near the beginning of the chapter, Neville is assigned the task of disembowelling horned toads as punishment from Professor Snape. When Hermione teaches him the Scouring Charm to remove the filth from under his fingernails, they're referred to as "frog guts". However, the horned toad is actually a species of lizard, despite the name.
    • Since this was from Harry's point of view, however, he might not have known that fact and simply assumed the horned toad was a species of frog.
  • Barty Crouch Jnr says that the Ministry dictates that he is to teach only counter-curses to fourth-years, and not to actually show them any dark curses. However, towards the end of the book (in the penultimate chapter, The Parting Of The Ways), Cornelius Fudge says that he's always given Dumbledore free rein over what's taught at Hogwarts, with no interference from the Ministry.
    • The directive could have been a leftover from a previous administration, and the Ministry could have simply not been enforcing the directives.
    • Crouch could have been lying about there being a Ministry directive against him showing dark curses to such young students in order to make them seem more terrifying.
    • For all that, it is unclear what Crouch actually teaches them this year, as Harry had to learn the Stunning and Impediment spells on his own, and in Harry Potter and the Order of the Phoenix, in the first meeting of Dumbledore's Army, nobody appears to know anything more advanced than Expelliarmus.
  • Crouch says there is no known way of blocking the Avada Kedavra curse. However, Harry blocks it with his own spell in the battle against Voldemort, creating the Priori Incantatem effect, and Dumbledore also blocks the spell with physical objects in the following book. However, Crouch may have been referring to a lack of any spell that could block that curse, as opposed to physical objects or the Priori Incantatem effect. He also might have just said this to purposefully discourage the kids in his classroom of ever finding or believing in ways to block the Avada Kedavra curse.

Chapter 15: Beauxbatons and Durmstrang[]

  • The notice that says classes will end half an hour early for the arrival of the Durmstrang and Beauxbatons students states that 30 October 1994 is a Friday. However, it was really a Sunday.
  • When speculating how the visitors will be arriving, Ron suggests Apparition, saying that maybe under 17s in their countries are permitted to do it. However, as the Triwizard Tournament was only open to students aged 17 and above anyway, it wouldn't matter if they could. Also, Hermione reminds him that Apparition is impossible within the Hogwarts grounds, but there's still no reason why they couldn't Apparate to just outside the grounds and walk the rest of the way. Indeed, the trio do exactly that in the climax of the last book.

Chapter 16: The Goblet of Fire[]

  • Curiously, 1994 was the second year in a row in which Hallowe'en fell on a Saturday. In 1993, Professor Trelawney's prediction to Lavender Brown warned her that her worst fears would come true on Friday, 16 October. In 1994, 30 October was the date of the arrival of the Durmstrang and Beauxbatons students and was a Friday; the same day of the week it would have been in 1993 as the 30th fell exactly two weeks after the 16th. That is not possible because the same date does not fall on the same day of the week two years in a row.
  • When explaining the structure of the tournament, Dumbledore says that the winner will be the champion with the highest points total at the end of the three tasks. However, come the final task, the points have been converted into a staggered start order, and the winner is the first to touch the cup. Either Dumbledore was wrong, the plans changed, or this is a mistake.
    • He doesn't say in the book that the first person to touch the cup will be the winner (though he does in the film), he says that they will receive full marks, so they may not necessarily win.

Chapter 17: The Four Champions[]

  • Harry is said to be facing competitors who'd had three years more magical education than he had. But Cedric was only two full school years above Harry, so he'd only had two years' more magical education than Harry. However, Harry could have simply been referring to their ages and not their exact years of magical knowledge.
    • The book never says that all of Harry's competitors are three years above him: just that Harry would be up against those who are. Given that Cedric Diggory is only two years above Harry, "competitors who'd had three years' more magical education than he had" could be taken to mean Viktor Krum and Fleur Delacour but not Cedric Diggory.

Chapter 19: The Hungarian Horntail[]

  • As Hagrid takes Harry to see the dragons and he stops to pick up Madame Maxime, Harry wonders to himself "Had Hagrid wanted to show him Madame Maxime? He could see her any old time he wanted...she wasn't exactly hard to miss....". But this implies that Madame Maxime is easy to miss, the opposite of what is intended. It should say something to the effect of "she wasn't exactly easy to miss".

Chapter 20: The First Task[]

  • The things Harry hears in the tent as the other champions battle their dragons don't seem to have any relation at all to Ron's description of what they did.
  • In the first task, nowhere has it been stated that one could not retrieve the Golden egg through the use of a Summoning Charm, but none of the champions even attempted this most simple system to do so. However, it is stated that the first task was designed to test the champions' daring and courage; thus, using a Summoning Charm would be too easy — almost to the point of cheating. It is possible that use of this spell would have resulted in a bottom score, or that there were enchantments on the eggs to prevent Summoning.

Chapter 21: The House-Elf Liberation Front[]

  • Ron says Percy would not recognise a joke if it was dancing naked in front of him wearing Dobby's tea-cosy. This, however, is an oxymoron: it is impossible to be both naked and wearing something, for if one is one of these, they are, by definition, not the other.
    • This is probably intended to mean that it would be naked except for the tea-cosy, and is simply poorly worded.

Chapter 23: The Yule Ball[]

  • Harry and the Weasleys abandon their snowball fight return to the castle at 7:00 pm, when it had become "difficult to aim", implicitly because it had got dark. However, in the Scottish Highlands, the sun sets around 3:30 pm on 25 December.[15] As such, it would have already been fairly dark when Hermione went up to the castle at 5:00 pm.
  • There was no Christmas tea because the Yule Ball included a feast. So did the first-through-third-years who hadn't been asked to the Ball go hungry?
    • It is possible that there may have been separate parties for them in their house common rooms.
  • Krum mispronounces Hermione's name as if he had only read it. Rowling has stated she included this bit specifically because readers didn't know how to pronounce "Hermione", but that doesn't make sense as Krum had only heard the name, not read it.
  • In the European and Canadian versions of the book, Snape shouts, "Ten points from Hufflepuff, Fawcett! And ten points from Ravenclaw too, Stebbins!" Really, Fawcett is in Ravenclaw, and Stebbins is in Hufflepuff.
    • It may, of course, be that Snape, angry as he was, mixed up the two students' affiliation to the houses. The American version corrects this error, but in a deleted scene from the film, included in the uncut DVD, Fawcett is again the Hufflepuff and Stebbins the Ravenclaw.
  • When talking about Olympe Maxime's supposedly big bones, Harry states that dinosaurs have even bigger bones. As he was talking in the present tense, he was (regardless of what he meant) actually referring to modern dinosaurs: birds. As most birds are much smaller even than humans, they have correspondingly smaller bones, and even ostriches (the largest birds) are much smaller than half-giants, meaning Harry's statement is incorrect.
    • It is very likely, however, that despite the technicalities, Harry meant the extinct, non-avian dinosaurs.
  • Harry's statement that dinosaurs are the only beings with bigger bones is, given the context, seemingly meant as a rejection of the idea that she has big bones, but it is in fact assent.
  • Dumbledore says that he stumbled across a magnificent lavatory, stated in the next book to be the Room of Requirement. However, it is stated there that one must walk past it three times (therefore going in circles for a bit) to access it, which makes it rather unlikely that he simply stumbled across it, especially if he was as desperate for the toilet as he said he was; he wouldn't have hung around, surely. Also, he said the room had disappeared when he went back to investigate, but going to investigate it means he was actually seeking the room; it should therefore have appeared to him.
    • It is possible that Dumbledore did in fact know about the room, but was pretending not to while giving covert hints about it. It is also possible that Dumbledore was simply being jocular (something he's known for) when he mentioned having an exceptionally full bladder.
    • As for the room not reappearing, it's possible that this was because Dumbledore only wanted it, as opposed to needing it.

Chapter 24: Rita Skeeter's Scoop[]

  • The Daily Prophet article DUMBLEDORE'S GIANT MISTAKE mentions that Alastor Moody was hired 'In September of this year'. If the article was indeed published in the most recent edition, then this would technically mean September 1995, which, at this point, is in the future.
    • It is possible, however, that the article was referring to school year.
  • Furthermore, Moody cannot have been hired in September; 1 September is the date term, and therefore he, starts. Therefore, for him to have been hired in September, he would have had to have been hired that very morning, which is impossible:
    • The booklists had already been sent out, implying that he had already been hired, as in the following book, they weren't sent until Umbridge was appointed, at the eleventh hour.
    • Amos Diggory stated that morning that he knew about the appointment; it is highly unlikely he would have found out about it that quickly, especially as he's not seen to be involved with the school in any way.
    • It would mean that Bartemius Crouch Junior and Peter Pettigrew had no time to plan, let alone execute, their attack on him, nor would they have had any reason for doing it if they were unaware of the appointment (e.g. if he had not already been appointed).
    • It is possible that the reference to him being hired in September was meant to say that he started the job then and Rita simply made a mistake. Besides, it's shown that she doesn't exactly care about being accurate in her articles anyway!

Chapter 25: The Egg and the Eye[]

  • After Harry is returning from figuring out the egg clue in the prefect's bathroom he gets stuck in the vanishing stair. This causes the egg to fall down the stairs making a racket and the Marauder's Map to flutter away. Harry struggles to reach the map with his wand to clear the information. However, Harry just perfected the Accio summoning charm for the first task. He could have summoned the egg and the map and hid under the invisibility cloak until Filch and Snape gave up and left.
    • As noted for the mistake from Chapter 20, the egg may have been enchanted to prevent summoning. As for the map, Harry may have panicked and forgotten that he could summon it - indeed, the French version of the novel explicitly includes this explanation, the translator having apparently identified it as a major omission.

Chapter 26: The Second Task[]

  • In the Second Task, Viktor Krum transfigures his top half of his body into a shark's head to swim underwater without the need of air. However, in Quidditch Through the Ages it clearly states that when transfigured into an animal, the wizard loses all sense of human thought and becomes the animal until another wizard can transfigure them back. Krum who transfigured his head into a shark really should have attacked Hermione and not been able to do the task at all. Although, it is possible that due to the fact that Krum only partially transfigured himself, he might still have some control over his thoughts and actions.
    • Or, as 'The Marauders' (James Potter, Peter Pettigrew, Sirius Black and Remus Lupin) were able to be Animagi (but not Lupin as he was already a werewolf), Viktor Krum might be able to be 'Part-Animagus', but whether this is possible is unknown.
  • Cedric and Fleur use the Bubble-Head Charm to perform the Second Task. It's unclear why Harry never found out about this spell, given how many books he looked through when researching the task.
    • Harry was searching for a spell to enable him to survive without oxygen, which isn't what the spell does; it provides a supply of oxygen while underwater. As a result, Harry may have overlooked this spell.

Chapter 27: Padfoot Returns[]

  • Snape says that the Gillyweed Harry used in the Second Task (which was given to him by Dobby) was stolen from his private stores. However, two chapters ago ("The Egg and the Eye"), he states that he locks his private stores with a charm that only a wizard can break. So it should have been impossible for Dobby to steal it.
    • Snape may have underestimated elf magic, or perhaps Crouch Jnr broke it just before staging the conversation in which he made sure Dobby heard about Gillyweed, to ensure he would be able to get in.

Chapter 28: The Madness of Mr Crouch[]

  • Harry and the other champions were shown what the third task was a month in advance. Why weren't they over the maze on brooms every day, and taking practice runs through it, until they had completely memorised it?
  • Barty Crouch Snr mentions that his son got twelve O.W.L.s. Once again, this is inconsistent with the time-table clashes from Prisoner of Azkaban.
    • However, given Crouch Snr's damaged state of mind, he could have just been rambling insanely.
    • Another possibility is that it is not necessary to take a class in order to sit an O.W.L. This is logical since Remus Lupin mentions in Deathly Hallows that until Voldemort took over the Ministry, parents were allowed to educate their children at home, though virtually all British magical children attended Hogwarts. These students would presumably need the credentials given by an O.W.L. or an N.E.W.T. in order to obtain employment in many occupations. It is thus possible that a highly motivated student may be able to do "independent study" to achieve an O.W.L. or that a student was already so familiar with the Muggle world, for example, that they could easily pass an O.W.L. in Muggle Studies without attending classes.
    • It could also be explained as Barty Crouch Junior being provided with a Time-Turner, similar to how Hermione is provided with one in the previous book.
  • In some printings, the spell to revive Krum and Crouch from unconsciousness is Ennervate. The correct spelling is Rennervate, since Ennervate would have the opposite effect (corrected in later editions).
  • On page 550, Cedric Diggory discusses with Harry what the third task of the Triwizard Tournament might be. He says Fleur keeps talking about underground tunnels and how she believes the champions will have to find treasure. Harry believes that that wouldn't be too bad because he could borrow a "niftier" from Hagrid. It appears to be a spelling mistake for the magical creature, the Niffler, which the fourth years recently learned about in a Care of Magical Creatures lesson.
    • Harry may have just forgotten the correct name of the creature since there only was one lesson with Nifflers up to this point. However, it seems unlikely because Harry is usually shown to retain information from most of his classes.
  • Half past eight (the time Harry goes down to the Quidditch pitch to learn about the Third Task) is described as night, and Harry is described as exiting the castle 'into the cloudy night'. However, sunset is a good deal later than that at that latitude and time of year (assuming Hogwarts is indeed near Dufftown, as claimed in Harry Potter and the Prisoner of Azkaban (film), sunset would have been around 9:45pm[16]). Therefore, it would still have been daylight when Harry went down to the Quidditch pitch.

Chapter 29: The Dream[]

  • Harry, Ron, and Hermione were supposed to call Sirius "Snuffles". Hermione calls Sirius "Snuffles" but she then calls him "Sirius" twice. It is likely, however, that Hermione simply made a mistake.
  • During the meeting between Fudge, Dumbledore, and Moody, Fudge is mistakenly referred to as both "Crouch" and also as his first name, "Cornelius".

Chapter 31: The Third Task[]

  • Before the Third Task starts, Molly Weasley reminisces about the gamekeeper before Hagrid, named Ogg. But in other books, it was implied that Hagrid had held that post since his expulsion from school in 1943. Since Hagrid's years as gamekeeper appeared to have overlapped Molly's years at school, it seems unlikely that she knew a previous one. The likely explanation of this is that since Hagrid was only thirteen years old when he was expelled, he started out as Ogg's assistant, and was still in this post when Molly started at Hogwarts.
    • Because it is never stated that Hagrid worked as gamekeeper continuously since his expulsion, it is also possible that Hagrid left the position before Molly started studying and then returned to it after she left.
    • However, from this same conversation, we know that Molly and Arthur were dating at Hogwarts, and it's stated in Harry Potter and the Half-Blood Prince that they got married in a hurry when the First Wizarding War was in full swing, which was at least 10 years (also per Harry Potter and the Half-Blood Prince) after Voldemort left Hogwarts. That would imply that Hagrid's apprenticeship to Ogg also lasted around 10 years, until Hagrid was 23, which seems kind of long.
  • Voldemort's entire plan (to return in secret and build up his army in secret before revealing his return on his own terms) falls apart if the spectators can witness the third task. If everyone sees Harry and Cedric grabbing the Triwizard Cup and then disappearing, everyone would notice something is up. However, by all logical accounts, the Third Task should have been visible to spectators. The hedges in this chapter (which were set up in the Hogwarts Quidditch Pitch) were described as being 20 feet high, and in Chapter 2 of this book ("the Scar"), quidditch goal posts were said to be 50 feet high. It is highly unlikely that the stands would be placed below the goal posts, as this would make watching the match very inconvenient. Thus, those in the stands should have been seated 30 feet above the top of the hedge maze, giving them plenty of height with which to see into the maze. For that matter, making the inside of the maze invisible to spectators defeats the entire reason the Triwizard Tournament was brought back after more than a century: Having enough safeguards that the risk of death was minimal.
  • When Harry encounters the Limbo Mist, the sky is described as 'dark, star-spangled', which suggests that it was astronomical twilight if not full night, neither of which occur at that latitude and time of year.[17] Even if astronomical twilight did occur, it does not transition that quickly (when the task starts, the sky is described as 'deep, clear blue', with 'the first stars starting to appear', which suggests nautical twilight had just begun), and it is highly unlikely to have taken that long for Harry to encounter the mist. There may have been a few stars, but it seems unlikely that the sky was dark enough or that there were enough stars to reasonably describe the sky as 'star-spangled', and even describing the sky as 'dark' may be considered an exaggeration: during nautical twilight, it would have been semi-dark at most.
    • Nautical twilight would have begun at around 11:30pm (which seems rather late for even an event as major as a Triwizard Task). This also means that it's extremely likely that the Return of Lord Voldemort would have technically occurred on 25 June rather than 24 June, in the early hours.
  • When Cedric sent up red sparks, one would think one of the teachers would have got there immediately, but none did.
  • How could the teachers have got there in time to rescue a contestant anyway, for instance if Harry was about to become a tasty snack for the Acromantula? Did they lift the anti-Apparition jinx on the Quidditch pitch for the task?
  • Why wasn't the Triwizard Cup charmed to prevent summoning? (Harry summons it to escape Voldemort a few chapters later)
    • Summoning the cup would presumably have led to disqualification. However, it would still have spoiled the task; it seems odd that no measures were taken to prevent such an obvious and simple method of doing that.
    • Another possible explanation is that there was indeed such an enchantment on the cup, and that this enchantment lifted after it was used as a Portkey for the first time.

Chapter 32: Flesh, Blood and Bone[]

  • In this and the next two chapters, Wormtail and Voldemort perform a wide assortment of dark magic - including all three Unforgiveable Curses - in rapid succession in close proximity to Harry, who still had the Trace on him. Bear in mind that, in 1992, when Dobby used a Hovering Charm, the Ministry noticed it immediately and, thinking it was Harry, had an owl sending a warning letter to Harry in only a few minutes. Also, remember that the Ministry knew that it was specifically a Hovering Charm (as opposed to simply "magic") being performed. By that logic, in this and the next two chapters, the Ministry should have instantly noticed the Unforgiveable Curses being performed in close proximity to an underaged wizard. Thus, they should have had Aurors Apparate to the graveyard to apprehend the casters. Never mind the potential for underaged magic; the fact that the Unforgiveable Curses were being used at all was grounds for Auror investigation! While the curses may not have been illegal if used on anyone other than a human being, that is not an excuse for the Ministry to not at least inquire into the matter, just in case.
    • It is possible that the Trace is not active or monitored during term time, when students are supposed to be at Hogwarts. This would also explain other instances where magic was used around underage wizards and witches outside Hogwarts apparently without setting the Trace off.

Chapter 33: The Death Eaters[]

  • Voldemort tells Harry that it was his father, Tom Riddle Senior, who gave him the name Tom Riddle, but in the sixth book, it is revealed that it was in fact his mother, Merope Riddle, who named him so.
    • It is possible that Voldemort was simply unaware of this (this seems unlikely, however, as the orphanage staff presumably told him of this), or that he chose to ignore this fact out of hatred for his father.
    • Another possibility is that they had both agreed before Tom Riddle Senior left what to call him, and that Merope went along with it out of love for him despite his desertion. If this was the case, though, it seems impossible that the orphanage staff could have known about it.
  • Voldemort calls the Death Eaters "those who knew the steps I took, long ago, to guard myself against mortal death". But in Harry Potter and the Deathly Hallows it's made clear none of them knew about the Horcruxes.
  • If Voldemort was "ripped from his body" when his attempt to kill Harry backfired, what happened to his body?
  • Voldemort states that, in his spirit form, he had been willing to have a mortal life before setting his sights on immortality, but he was already immortal due to his Horcruxes. Indeed, in the seventh book, after finding out that Harry was going after his Horcruxes, he thought of them as his 'anchors to immortality'. The fact that he had survived the Killing Curse and spent 14 years without the usual forms of sustenance is also suggestive of immortality.
    • It is possible that Voldemort was referring to permanent, independent immortality, as his immortality was dependent on his Horcruxes remaining intact. However, Voldemort is never shown or implied to have sought another form of immortality.
    • How did Voldemort get to the forest in Albania, twice, when here he states that he needed Peter Pettigrew's help to create a body he could travel in to get back to the UK?
  • Voldemort explains that Dumbledore invoked an ancient magic to protect Harry when he's with the Dursleys, but how did he know about it? In the next book, a big deal is made of his lack of understanding of love, not to mention he had fled far away in spirit form and never even went near Harry or attempted to get to Harry while he was with the Dursleys, and certainly not while in spirit form.
    • It is possible that Voldemort did indeed attempt to get to Harry and failed precisely because of the protective charm, then later found out that it was the reason for him failing. However, as he was in spirit form from the moment he tried to killed Harry until just minutes prior (except for inhabiting beings), it is unclear how he intended to harm Harry anyway. If this is the case, though, he must have done so before fleeing to Albania, but it seems unlikely, as he said that Aurors were looking for him and that he did not dare go anywhere densely populated by humans.
    • Another possibility is that Voldemort, when inhabiting Quirinus Quirrell in Harry Potter and the Philosopher's Stone, used Legilimency (via Quirrell) on Dumbledore to gain information. As Dumbledore was unaware Voldemort was there, he would have had no reason to use Occlumency. However, if this is the case, he surely would have known all about the Philosopher's Stone's protections.
    • There's an outside chance that Peter Pettigrew somehow found out about it and told him after he returned to him, though how he could have found out is anyone's guess. Perhaps Dumbledore decided to tell McGonagall the real reason he left Harry with the Dursleys, and Pettigrew (as a rat) happened to be listening in?
    • It is also possible that he hung about at the ruins of the Potter cottage after his body was destroyed, and somehow discreetly followed Hagrid and Harry to 4 Privet Drive and watched the proceedings there before fleeing, though it is unclear exactly how the bond of blood charm was cast, as no magic was performed there (unless Dumbledore performed it wandlessly and nonverbally).

Chapter 34: Priori Incantatem[]

  • Toward the end of the book when Voldemort puts the Imperius Curse on Harry, the book says "for the third time in his life," but toward the middle of the book it states Harry had the Imperius Curse put on him four times by Moody (Crouch, Jnr.).
    • This, however, may have been a reference to the number of occasions and situations on which it was used rather than the exact number of times the curse was placed on him.
    • We never hear of anyone else throwing off the Imperius Curse as easily as Harry does it, even Barty Crouch Sr. who was supposedly “powerfully magical”.
  • In what is now known as the "Wand Order Mistake," when Harry and Lord Voldemort's wands engage in Priori Incantatem while in the graveyard, James Potter exits the wand before Lily Potter. It has always been said that James died first as he was trying to give Lily and Harry time to flee, and since victims of Lord Voldemort were exiting the wand in reverse order of being killed, it was thought to have been a clue from J.K. Rowling.
    • Rowling later said that "late night writer's fatigue" was the reason, and the error has been fixed in later editions.
  • Prior to Bertha Jorkins coming out of Voldemort's wand there should have been indication of Voldemort making a Horcrux with her death, after she appears but before Lily appears there should also have been some indication of the methods Voldemort used to break her memory charm. It is of course possible he used another wand in both cases, but it is unlikely he would have changed wands shortly after killing Bertha.
    • It is also possible that he did both these things without a wand, though what motive he might have had for doing the latter without a wand is unknown.
  • There should also have been some shadow of the Killing Curse on Harry that rebounded on Voldemort.

Chapter 35: Veritaserum[]

  • Dumbledore says he knew Moody was an impostor the moment Moody took Harry to the castle against his orders, and immediately followed. But it took him, McGonagall and Snape a surprisingly (and conveniently) long time to get to Moody's office.
  • Dumbledore tells Snape to bring up Winky, which implies he knew the impostor was Barty Crouch Jr. How could he have figured that out? (Though it might not have been a stretch to assume it had something to do with Crouch Sr. given his disappearance.)
    • Legilimency, maybe?
    • Or perhaps he was listening in on his confession, and deduced that it was Barty Crouch Jnr?
  • On page 594 in the first edition of the Canadian paperback and page 685 of the first edition American hardcover, when Dumbledore is questioning Barty Crouch, it says, "'How did your father subdue you?' said Dumbledore. 'The Imperius Curse,' said Moody." Crouch is mistakenly referred to as Moody in this sentence because it was after Barty Crouch had already returned to his original physical state (no longer an impersonation of Moody). Crouch had already been referred to by his real name earlier on that page, and the real Moody was lying stunned at the bottom of the trunk in his office.
  • Barty Crouch Jnr says that he conjured the Dark Mark with Harry's wand and then he and Winky were Stunned by one of the Ministry wizards' spells. So how is it that Amos Diggory found Winky holding the wand?
  • Barty Crouch Jnr says that Wormtail and Voldemort stayed in the Crouches' house after he went to Hogwarts as Moody. But in Harry's second dream, they are in what is clearly the Riddle house. And, the article in the Daily Prophet that Sirius scavenges says his "house appears deserted".
    • It is possible that they did indeed stay at the Crouches' house at first, and relocated to the Riddle house afterwards, the likely reason for the relocation being that the Crouches' house would be one of the places the Ministry would look after Crouch Snr stopped turning up for work due to his apparent illness.
  • Barty Crouch Jnr put Harry's name in the Cup under a fourth school. That indicates that any underage student could have entered by having an of-age student put their name in for them. Indeed, after Harry's name came out of the Goblet, Dumbledore actually asked him if he asked an older student to put his name in, which suggests that that would have worked, making Dumbledore's age line rather pointless. Crouch had only confunded the Goblet to ensure Harry's name would be chosen, as opposed to just being considered.
    • It is, however, still possible that a student would still have been disqualified if they had asked an older student to put their name in: it is revealed in this chapter that Barty Crouch Snr was under an Imperius Curse cast by Voldemort; it is possible that Voldemort made him make Harry compete, under the excuse that the Triwizard Tournament rules state that anyone whose name comes out of the Goblet of Fire must compete, and that the new age rule would have prevailed in other circumstances.
  • Barty rigged the entire tournament to fool Harry into making contact with a Portkey, even though a Portkey can literally be anything. Had Crouch simply made a Portkey of his bedsheets or a schoolbook, Voldemort could have returned months sooner.
    • One possible explanation is that, much like apparition, portkeys do not work into or out of Hogwarts grounds unless the Headmaster explicitly authorises them. This would also avoid a potential plot hole: If the Third Task was not visible to spectators, how would the judges determine the winner if it was disputed who reached the cup first? Having the cup teleport the first one to touch it to the start of the maze is a foolproof way of knowing who touched it first. Thus, Voldemort had to wait patiently for Dumbledore to temporarily lower the anti-portkey defences in and around the Hogwarts Quidditch pitch, and only then could Crouch Jnr (disguised as Moody) volunteer to perform the task of turning it into a portkey.
    • Furthermore, as Sirius explains in the next book, Voldemort wanted to keep his return a secret (at least at first) and Harry's unexplained disappearance would make that harder to achieve. It is likely that Voldemort had been planning to transport Harry's dead body back to the maze via the portkey so as to pass his death off as an accident.
  • Crouch says that he and Pettigrew subdued Alastor Moody just in time. This is presumably meant to refer to the police turning up, as it can't have been referring to the Ministry turning up, because he hadn't set the dustbins off yet, which is what alerted the Ministry (until then, it had been a duel like any other). But earlier on in the book, Amos Diggory said that one of the dustbins was still moving around when they arrived, which suggests that some time had passed between the dustbins being set off and the police arriving.
  • Crouch said he set Alastor Moody's dustbins off to cover the commotion that was the Attack on Alastor Moody, and that Mr Weasley had arrived to deal with the Muggles who heard the disturbance. But Mr Weasley had in fact been sent to deal specifically with the dustbins; the disturbance he had been informed of was the dustbins going off, not just any old disturbance. In fact, if he hadn't set the dustbins off, the disturbance may not have needed covering; it could have easily been passed off to the police as a domestic, burglary, or something similar, and the Ministry needn't have got involved.
  • And, why did Crouch need to pass it off as intruders, when that's exactly what it was in reality? Why didn't he just say they fled from him? Why involve the dustbins?
    • The most likely explanation is that he didn't want the Ministry snooping around, lest they find the real Moody, so he created this diversion to divert their attention away from inside the house. This is never stated, however. Nor does this explanation actually make any sense when one considers that it was apparently the dustbins being set off that alerted the Ministry in the first place.
    • Apparently, Crouch was already expecting the Ministry to turn up. But if it wasn't the dustbins going off that alerted them, what was? The Muggles called the police because they heard bangs and shouting, neither of which are indicative of magic, whereas dustbins moving around of their own accord shooting rubbish most certainly is.
      • One possibility is that the Ministry monitors incident reports to the Muggle police, and this one was flagged because it was at Alastor Moody's house, so they assumed magic was involved and decided to investigate a potential breach of the International Statute of Wizarding Secrecy. This would also explain the above-mentioned oddity about subduing Moody just in time, for if they saw the police arriving, they'd have known that the Ministry would know about it. None of this is ever stated, though.

Chapter 36: The Parting of the Ways[]

  • Why did it not occur to Dumbledore or Harry to show Fudge Harry's memories of the Return of Lord Voldemort? As with the similar mistake in Harry Potter and the Prisoner of Azkaban, surely Dumbledore could have performed the memory extraction spell if Harry could not?
  • Dumbledore appears to claim that it was Fudge's idea to put the Dementors in charge of Azkaban. But when Harry witnesses the proceedings in the Pensieve, it's clear that the Dementors already have the job, and in Harry Potter and the Deathly Hallows we see 11-year-old Snape telling Lily (and overheard by Petunia) that the Dementors guard Azkaban, both of these well before Fudge became Minister of Magic.
    • It is possible that Dumbledore was referring to Fudge continuing to use Dementors to guard Azkaban despite being informed of the risks in doing so in light of Voldemort's return. However, per the above, the Dementors were guarding Azkaban during the First Wizarding War, which surely carried the same risks, though it is possible that Dumbledore warned against it (and was ignored) back then too.
  • Dumbledore tells Sirius to alert Remus Lupin, Mundungus Fletcher and Arabella Figg. The latter two are an odd choice of members of the Order to alert first.

Chapter 37: The Beginning[]

  • Harry asks why Dumbledore wants him to return to the Dursleys for the summer, but he should have already known why, as Voldemort, although he did not refer to the Bond of blood charm by name, told all present at his return (which included Harry) about it protecting him while he's there. This is the exact same explanation Dumbledore would give Harry a year later towards the end of Harry Potter and the Order of the Phoenix, albeit in much more detail, and it is only then that Harry finally understands why he had to live with the Dursleys for all those years, but the actual reason (that he is protected from Voldemort there) had already been imparted to Harry at this point; the rest was just details.
  • Dumbledore tells the students that Cedric Diggory was killed by Voldemort, but he was in fact killed by Peter Pettigrew, albeit on Voldemort's orders.
    • It is possible that Dumbledore said Voldemort rather than Pettigrew so as not to confuse the students, because they would either not have known who Pettigrew is, or have believed him dead, and because it is still true in a way.

Harry Potter and the Order of the Phoenix[]

  • In the U.S. and UK audiobook editions, Hermione pronounces the abbreviation for the Society for the Promotion of Elfish Welfare, S.P.E.W., as "spew" when speaking to Ron, despite her strong objections in the previous novel when Ron pronounced it this way, insisting on each letter being enunciated out loud.
    • It is possible that, as Ron seemed to be using that pronounciation to belittle the organisation, Hermione adopted it in an act of reappropriation.
  • In the book, classes begin the day after the Start-of-Term Feast. However, 1 September 1995 was on a Friday, which would mean that classes started on the weekend, which is unlikely.
  • Sirius Black told Harry Potter that Bellatrix ran in the same crowd as Severus Snape while at Hogwarts, but her date of birth makes this impossible. Bellatrix would have attended Hogwarts from 1962 to 1969, or possibly 1963 to 1970, depending on which month in 1951 she was born in, whereas Snape began his schooling in 1971.
    • This may simply be an error since J. K. Rowling has admitted that maths is not her strong suit.
    • Another possible explanation could be that both Bellatrix and Snape went around with the same type of people, some of whom may have overlapped depending on age. For example, Lucius Malfoy was mentioned to be a prefect during Snape's Sorting in Deathly Hallows. However, this is rather unlikely as Bellatrix was heavily implied to be extremely active in Voldemort's war throughout the 1970s.
  • It is mentioned that Remus, rather than James, was the male Gryffindor prefect in Harry's father's year. However, Hagrid mentions in Philosopher's Stone that James and Lily were Head Boy and Girl at Hogwarts. Since it is implied that the Head Boy and Girl are chosen from the prefects, this does not work.
    • Although it is implied that the Head Boy and Girl are chosen from the prefects, it is never explicitly stated, so James could have been Head Boy without being a prefect.
    • If James had been Quidditch Captain, he could have become Head Boy through that, as Quidditch Captains have equal status with prefects.
    • Hagrid could simply have been mistaken in thinking that James had been Head Boy, but this is very unlikely as he knew him quite well due to both being members of the Order.
  • It states that after watching Ginny play it was Harry's first time watching Quidditch in the stands but Harry would have watched all the other matches that didn't involve Gryffindor (all matches since his first year at Hogwarts).
    • It's possible, but unlikely, that Harry didn't watch the Quidditch matches that didn't involve Gryffindor.

Chapter 1: Dudley Demented[]

  • Disapparition usually makes a small pop, not a loud crack. And members of the Order, including Mundungus, have been taking shifts guarding Harry all summer, but apparently nobody has heard this crack before now.
  • The Order members Apparating and Disapparating around Privet Drive should have set off Harry's Trace.
  • By the time Harry starts heading back to Privet Drive, night is stated to have fallen, with stars in the sky, which were vanished by the Dementors. In the following chapter, Mafalda Hopkirk's letter to Harry stated that he cast the Patronus Charm during the the attack at precisely 9:23pm. During Harry's trial several chapters later, it is revealed that the date was 2 August. Depending on exactly where in Surrey Little Whinging is, sunset on 2 August is around 8:50pm; therefore, it would still have been civil twilight, meaning that not only would it have not been that dark, there wouldn't have been many, if any, stars to vanish.

Chapter 2: A Peck of Owls[]

  • Harry's first supposed breach of wizarding law in Harry Potter and the Chamber of Secrets was treated as a breach of both the Decree for the Reasonable Restriction of Underage Sorcery and the International Statute of Wizarding Secrecy, yet Hopkirk's letter, about exactly the same kind of incident, treats this incident solely as a breach of the decree, not the statute, even though it acknowledges the first incident as a breach of the statute.
    • It is possible that this wasn't treated as a breach of the statute because the Muggle in question (Dudley Dursley) was already aware of the wizarding world; however, this ignores the fact that Harry still did it in a very Muggle area, and it could have been noticed by a Muggle passing by or looking out of a window. However, Harry's hearing does mention breaches of the statute, albeit briefly, as even there, the focus was on this incident as a breach of the decree rather than the statute.
  • Uncle Vernon is appalled to discover that there is a Ministry of Magic. But surely he already knows about it, since he read the warning letter Harry got from the Improper Use Of Magic Office in Harry Potter and the Chamber of Secrets, and the Accidental Magic Reversal Squad showed up at his door in Harry Potter and the Prisoner of Azkaban to deal with Aunt Marge.
  • After Harry tells Uncle Vernon about Voldemort and Uncle Vernon tells Harry to get out, Dumbledore sends Petunia a Howler which says "Remember my last, Petunia" referring to the letter Dumbledore had left on the doorstep with baby Harry. Later, in Chapter 37, Dumbledore explains that Petunia "might need reminding of the pact she had sealed by taking [Harry]". However, in chapter 5 of the Chamber of Secrets, after Harry and Ron crash the Ford Anglia into the Whomping Willow, Dumbledore says he will "be writing to both [their] families tonight". This means that the Howler was referring to this letter about the flying car rather than the letter written by Dumbledore on the night of Lily and James's death as intended. Yet, if Dumbledore's letter about the car was addressed to 'The Dursleys' (including Vernon), it is most likely that 'Remember my last, Petunia' was a reference to the last letter that Dumbledore sent exclusively to Petunia.
  • Mrs Figg tells Harry that she had stationed her cat, Mr Tibbles, to keep a watch on the Dursley house. However, in the first book, it gives a short list of Mrs Figg's cats, one of which is simply Tibbles, as opposed to Mr Tibbles.
    • A possible explanation is that Harry some or all of her cats' names mixed up, which is understandable as she has so many. Also, it's possible that they both refer to the same cat, only she calls it by slightly different names.
    • She could also be referring to the same cat, but changing whether or not to use the honorific. Many people switch between using 'Mr' or not before a name.

Chapter 3: The Advance Guard[]

  • When the Advance Guard arrives at 4 Privet Drive to take Harry to 12 Grimmauld Place, Harry is already in trouble for casting a Patronus Charm in the presence of a Muggle. Yet, Tonks casts several spells (Lumos, a packing spell, Scourgify and Locomotor Trunk) and Moody casts a Disillusionment Charm on Harry while they are still at 4 Privet Drive. Lupin had clearly stated that they were not using the Floo Network because they were being watched (by the Ministry), so of course the Ministry was not aware of any Wizards that are allowed to do magic inside Harry's house. If the Ministry can detect magic, and Harry is the only known wizard in Little Whinging, then he should have either had another owl sent from the Improper Use of Magic Office or the uses of those spells should have been brought up at some point during his trial.
    • Possible explanations include the fact that there were no Muggles present at the time, or that unlike Dobby, magic used by registered wizards does not activate the Trace. However, this is inconsistent with the seventh book, when Harry is told they had to escape using Polyjuice Potion and physical transport because using any magic at all around Harry would alert the Ministry to his presence. However that could be because of the rise of Voldemort at the time meaning heightened security around Harry - including making the Trace far more sensitive to spellcasting.
  • Why was Harry the only one to be Disillusioned? Although Harry needed to be hidden from Death Eaters, they all needed to be hidden from Muggles. Indeed, Moody tells them all to take a hard turn when he spots a Muggle looking up, and specifically avoids Muggle towns. And we're just going to assume that all the Muggles in Privet Drive were asleep or looking the other way when the group all took off on brooms in plain sight (a Muggle in a neighbouring house could easily have been looking out of the window at number 4's back garden; the group made no effort to keep their voices down, which could have attracted the neighbours' attention) and that all the Muggles in the area in which they descended were asleep too.
    • It's possible that they needed Harry to be able to see them, but then, how did they keep track of Harry?
  • Why couldn't an Order member have taken Harry to Grimmauld Place by Side-Along Apparition? It is revealed towards the end of the book that Dumbledore wanted to distance himself from Harry, but why couldn't another Order member have done so? In the following book, Dumbledore takes Harry away from Privet Drive by it, and the Ministry even recommends it, which suggests that it is at least a fairly common skill.
    • One possible explanation is that they needed to be sure the street was devoid of Muggles, but this shouldn't have been a problem if they were both Disillusioned or under Harry's Invisibility Cloak.
  • The group bore south a lot, which is the opposite direction they needed to go in to get from Surrey to London.
    • As the full details of the course Moody took them on are not revealed, it is possible that they took lots of detours, presumably to throw off any Death Eaters who may have been following. Indeed, after they arrived at 12 Grimmauld Place, Bill Weasley jokingly asked if Moody took them on a detour through Greenland.
  • Nymphadora Tonks complains about getting soaked should they go through clouds. Apparently, none of the group were familiar with the Impervius Charm, including Harry, despite the fact it had been used on him previously.

Chapter 4: Number Twelve, Grimmauld Place[]

  • Shortly after his arrival at 12 Grimmauld Place, Harry says that he had been at 4 Privet Drive for four weeks, but, as the date can be deduced to be 6 August, he had in fact been there for more than five.

Chapter 6: The Noble and Most Ancient House of Black[]

  • A nest of dead Puffskeins is discovered in 12 Grimmauld Place under a sofa. But according to some information, it's impossible, because the Puffskeins are too big for going under a sofa and making nests.
    • This does, however, depend on the type of sofa - some do have larger gaps beneath them than others, especially older sofas, which Grimmauld Place may well have had. Additionally, the Puffskeins could have made a nest in the underside of the sofa which spilled out into the space beneath, like rats.
  • Sirius explains that he has been cooped up in 12 Grimmauld Place since the start of the Second Wizarding War, since he is wanted by the Ministry and his dog form is now known to the Death Eaters, as Wormtail would most likely have told them about it. However, it is revealed in Deathly Hallows that Mad-Eye Moody has a large supply of Polyjuice Potion on permanent standby in case of emergencies (Hermione borrowed some of that potion for their upcoming Horcrux hunting mission, since Moody obviously wouldn't need it anymore). So it is unclear why Moody didn't simply lend some of his Polyjuice Potion to Sirius so he could exit the house every once in a while, and perhaps even go on missions for the Order, without anyone outside of the order recognising him.
    • It is likely that Moody felt it necessary to keep his supplies with himself in case of an emergency, and Dumbledore felt it necessary to use this as an excuse to keep Sirius at the HQ to stay in contact with Harry to provide him with valuable information about his father and monitor and promote his rebellion against Umbridge.
  • It is revealed that 12 Grimmauld Place is under the Fidelius Charm, with Albus Dumbledore as Secret Keeper. How, then, was Hedwig able to enter the premises and deliver letters to Ron, Hermione, and Sirius?
    • The only possible explanation is that Dumbledore gave her the secret somehow; however, as she had been with Harry all summer, when would he have had an opportunity to do so? Maybe someone went outside and happened to notice her flying around? But how did she even find the house, if it was invisible to her?

Chapter 8: The Hearing[]

  • During Harry's hearing, Cornelius said that he blew up his aunt three years ago. However, the incident when Harry inflated Marjorie Dursley occurred almost exactly two years previously.
    • Although, this may be a mistake on Cornelius's part, and could show that he was not told accurate information, he had forgotten the date Harry blew up Aunt Marge, or that he was desperate enough to give away the wrong information; the second theory is most probable.
  • One of the charges against Harry is that of using magic in the presence of a Muggle, constituting an offence under the Statute of Secrecy, but as the Muggle in question (i.e. Dudley) already knows about the existence of the magical world, there's no point in charging Harry with this offence. However, it's possible that Fudge wanted to charge Harry with this anyway as part of his smear campaign against him, especially as he also brought up other incidents which weren't relevant to the trial.
  • Dumbledore says that the exceptional circumstances described in Clause Seven of the Decree for the Reasonable Restriction of Underage Sorcery include situations that threaten someone's life, clearly suggesting that the Attack in Little Whinging falls within the scope of that description, but this is not strictly speaking true, for a Dementor's Kiss does not physically harm its victim in any way. It also seems odd that everyone, including Fudge and Umbridge, accepted this suggestion without question, and, given their desperation to get Harry expelled, that they saw no technicality to jump on.
    • It is likely that Dumbledore was saying that it fits within the spirit of the clause, even if not to the letter, as the Dementor's Kiss is widely considered worse than death. It is also possible that this very issue may have been litigated some time many years ago, in a case where the Ministry didn't have a pre-existing bias. After all, there is no indication that the Wizengamot does not consider itself bound by the concept of "stare decisis," like real-life courts. In the real world, lawyers and barristers will frequently reference blackletter law simply by describing the concept, rather than by citing specific cases, so that may very well have been what Dumbledore was doing. It also worth noting that Fudge cut Dumbledore off mid-argument, implying that he already knew exactly where Dumbledore was going with this, so Dumbledore didn't need to say the rest of the argument out loud.
  • It is revealed that the Decree for the Reasonable Restriction of Underage Sorcery has provisions dealing with underage magic done in the presence of Muggles. These seem redundant, as magic done in front of Muggles is covered by the International Statute of Wizarding Secrecy.[18] A big deal is made of Harry doing magic in the presence of a Muggle, yet it is stated that the decree, not the statute, permits using magic in the presence of Muggles in exceptional circumstances, which begs the question of why it is part of this decree, which only applies to underage magic. In fact, it is stated earlier on in the book that the statute has self-defence provisions.[19]
    • It is possible that the decree prohibits underage magic in front of Muggles even if they already know about magic, but even this is redundant, as the decree prohibits underage magic whether in the presence of a Muggle or not.
  • When the Wizengamot is considering the verdict of Harry's trial, Madam Bones states 'Those in favour of clearing the witness of all charges?' As he has been accused of a crime and the subject of the trial, Harry should be referred to as 'the accused'. A witness attends court to give evidence only.

Chapter 9: The Woes of Mrs Weasley[]

  • Ron's prefect badge is described as scarlet and gold. Page 162 of the American paperback edition states, "A large P was superimposed on the Gryffindor lion. He had seen a badge just like this on Percy's chest on his very first day at Hogwarts." However, Percy's badge in Philosopher's Stone is described as silver with a P on it (later editions of the first book are fixed).
  • When Alastor Moody shows Harry the Order of the Phoenix photograph, he mentions that Caradoc Dearborn disappeared six months after the picture was taken, and implies that this was during the height of the First Wizarding War. However, he also mentions that Marlene McKinnon was killed two weeks after the picture was taken. Lily's Letter in Chapter Ten of the Deathly Hallows dates Marlene's death in late July or early August of 1981, putting Caradoc's disappearance around January 1982—three months after the end of the war.
    • However, it is possible that some Death Eaters continued to fight in Voldemort's name, similar to the group that tortured the Longbottoms.
  • In the American paperback edition, on page 161, when talking about the old Defence Against the Dark Arts teachers, Harry says, "One sacked, one dead, one's memory removed, and one locked in a trunk for nine months," referring to Lupin, Quirrell, Lockhart, and Moody respectively. However, according to the Prisoner of Azkaban American paperback edition, on page 423, Lupin did not get sacked — he resigned.
    • However, Harry could have interpreted Lupin's resignation as forced by Snape's revelation of his lycanthropy and therefore considered it the same as a sacking. Also, Fred does not mention either of his first two Defence Against the Dark Arts teachers, though it is possible that those two simply resigned and nothing particularly bad happened to them, thus no mention.
    • Lupin was not officially sacked, but there was pressure from the School Board for him to resign.
  • When asked to look into a desk in another room in Grimmauld Place, Mad-Eye Moody was able to determine it contained a Boggart. However, Remus Lupin established that nobody knows what a Boggart's true form is, as it always shapeshifts into the deepest fear of whoever sees it. It seems unlikely that the Boggart could have taken the form of Moody's greatest fear as he was not in the presence of the Boggart, so he must have seen it in its true form and known what it was.
    • It is possible the Boggart took the form of Moody's greatest fear and thus he was able to recognise it as a Boggart, but it has never been established that Boggarts can take on a subjective form if observed indirectly.
    • Maybe Professor Lupin didn't know that Moody has seen boggarts while he was teaching the lesson.
    • Because of this scene, it has also been said that Mad-Eye is the only person to have seen a Boggart in its true form.

Chapter 10: Luna Lovegood[]

  • The edition of The Quibbler that Luna is reading is stated to be the same one Shacklebolt gave Mr. Weasley on the day of Harry’s hearing a couple weeks previously, but Luna appears to be reading it for the first time, despite being the daughter of the editor.
  • Thestrals are invisible except to those who have witnessed death, but that shouldn't apply to their harnesses. It also appears that nobody ever bumps into them, or hears the sound of hoofbeats.

Chapter 12: Professor Umbridge[]

  • Ron says "That's the worst Monday I've ever seen" in reference to his and Harry's schedule for the first day of classes. As school commences with the feast on 1 September, this first day of classes would fall on 2 September. However, at the end of Chapter 6, it is written that the night before Harry's trial is a Wednesday. Thus, Harry's trial, which takes place on 12 August, falls on a Thursday. So 2 September would actually have to be a Thursday, as well. (And in 1995, 12 August and 2 September were actually Saturdays.)
  • The American edition incorrectly states that a normal class period is an hour and a half, when it should be 45 minutes. If a normal class ran that long, it would make a double period three hours. Since the students have four classes that day, two of them double periods, this would run into their lunch hour, and it would be past dinner by the time they finished.
  • When Umbridge first puts Harry in detention she tells him to be in her office at 5:00. On the following day, when Harry goes to detention, the book says that he went to dinner before then, which means that dinner at Hogwarts starts at least at half past four, which is unlikely. However, dinner isn't always referred to as the 'last meal of the day' - in other books Harry, Ron and Hermione have headed to dinner as soon as afternoon lessons have finished. So it is conceivable that dinner at Hogwarts is served fairly early as lessons in UK secondary schools tend to finish between 3.30pm and 4pm. 'Dinner' does refer to the evening meal as the book refers to the midday meal as 'lunch'. Some British people call the lunchtime meal 'dinner' and the evening meal 'tea' but the books call the meals 'lunch' and 'dinner'.
  • McGonagall authoritatively tells Harry that him getting into trouble with Umbridge is not about truth or lies, but about him losing his temper with her. This is rather ironic, given the words Umbridge would make Harry carve into his hand throughout the year, including in the very detentions she is revealed to have given him here. In fact, many of Umbridge's future sanctions against Harry, including the removal of his Hogsmeade visitation privilege, would be about him "telling lies", not losing his temper or any other rule-breaking.

Chapter 13: Detention with Dolores[]

  • Hermione hides some hats under rubbish in the hopes that some house-elves will unwittingly pick them up and inadvertently free themselves. However, this shouldn't work anyway. Even if house-elves can be freed simply by touching clothes of their own accord (rather than having clothes being given to them), Hermione has no power to free the Hogwarts house-elves, even if they wanted to be freed, as she is not their master, plus it's unlikely that elves can be freed this way, as this would make them unable to do laundry for their masters. If anyone can give clothes to a house-elf to free them regardless of whether they own the elf, then why did Harry need to resort to the "slimy sock and book" ruse at the end of Chamber of Secrets to get Dobby freed? Couldn't he have just given Dobby his own sock? And why didn't the Death Eaters give clothes to Kreacher to free him when he left Grimmauld Place just before Christmas?
    • It's possible that Hermione may not know enough about how elf ownership works to be aware that her ruse wouldn't work, although given the amount of research she did into the history of elf enslavement, there's a good chance that she would've picked it up.
    • Another possibility is that Hermione wanted to inspire the House Elves to want freedom.

Chapter 14: Percy and Padfoot[]

  • Apparently, the Wizarding legal system ignores the possibility that a suspect, e.g. Sturgis Podmore, was under the Imperius Curse, even when they refuse to speak in their own defence. That seems like kind of a major oversight.
    • It's possible that he was still under the Imperius Curse, and that it was making him act as if he was genuinely guilty.

Chapter 15: The Hogwarts High Inquisitor[]

  • In the UK audiobook version, the line "Then you get 'P' for 'Poor' and 'D' for 'Dreadful'" is delivered in Hermione's voice, when it is obvious from context that Fred is the speaker.
  • It is unclear why Dumbledore did not appoint himself as the Defence Against the Dark Arts professor; as revealed later on in the book, when Umbridge remains in the post after being proclaimed headmistress, the head can serve concurrently as a teacher. Not to mention that one might well think that being the one to defeat Gellert Grindelwald and the one whom Voldemort himself feared made him perfect for the job. Indeed, it is strange that Dumbledore does not do this at any point in the series, but it is salient here, as it is revealed in this chapter that his failure to fill the post led to Umbridge, whom Dumbledore presumably very much did not want in the post, being forcibly appointed to the post by the Ministry, against Dumbledore's will.

Chapter 16: In The Hog's Head[]

  • The disguised Mundungus Fletcher is already in the Hog's Head when Harry arrives for the meeting. How did he know that's where Harry was going?
  • Dennis Creevey shows up for the meeting in the Hog's Head. However, Dennis would only be a second year, and therefore unable to visit Hogsmeade.
    • Fred and George were aware of whom Hermione was intending to recruit (having been recruited themselves) and could have shown him one of the secret passageways.
  • Justin Finch-Fletchley, Colin Creevey, and Lavender Brown are mightily impressed that Harry had slain the Serpent of Slytherin with the Sword of Gryffindor, as if they are learning about it for the first time, yet it seems unlikely that they did not already know about it; they would have been celebrating with the rest of the school (in fact, Justin was shown repeatedly apologising to Harry, and it was made abundantly clear during the celebrations that Harry and Ron were the ones who put a stop to the attacks), not to mention that Justin and Colin were victims of said Basilisk. Terry Boot also asked Harry about it, but, for the same reason, it seems unlikely that he didn't already know.
    • It is possible that they knew that Harry and Ron stopped the attacks, but, for whatever reason, were not told the specifics of how.

Chapter 17: Educational Decree Number Twenty-four[]

  • According to the letter of Educational Decree Number Twenty-Four, Harry, Ron, and Hermione should have been expelled, for they regularly met (as should have Fred Weasley, George Weasley, and Lee Jordan, for they presumably also regularly met). Although the decree was presumably intended to refer to formal, pre-arranged meetings of three or more students, the wording creates a loophole: any meeting of three or more students, however informal or impromptu, is considered a student group.
  • Here, the staff room is guarded by two stone gargoyles and Harry had to knock on the door, but in Harry Potter and the Chamber of Secrets, Harry and Ron just waltzed in there as if they were members of staff, and there's no mention of said gargoyles or any other guard. In Harry Potter and the Philosopher's Stone, there are also no gargoyles, and again Harry was able to just open the door and go in. There is also no mention of any gargoyles when Remus Lupin took Harry's class there in Harry Potter and the Prisoner of Azkaban.
    • It is, of course, possible that the gargoyles were always there, and just not mentioned in previous books, but what was their purpose, if not to keep students out?

Chapter 18: Dumbledore's Army[]

  • Harry summons the escaping bullfrog with Accio in charms class. However, J. K. Rowling said "Accio only works on inanimate objects" after the Fantastic Beasts film was released.

Chapter 19: The Lion and the Serpent[]

  • Harry refers to the Dark Marks on the arms of the Death Eaters as scars when they are actually brandings.

Chapter 22: St Mungo's Hospital for Magical Maladies and Injuries[]

  • In an error unique to the U.S. audiobook editions of Harry Potter and the Order of the Phoenix, when Harry first arrives at 12 Grimmauld Place following his vision of the attack on Arthur Weasley, the line "Back again, the blood-traitor brats! Is it true their father's dying?" is rendered in the loud, screechy voice of Sirius Black's mother. Based on context clues, however, particularly the fact that this line is immediately followed by Sirius shouting "Out!" and Kreacher shuffling out of the room, it seems clear that it was actually Kreacher that uttered the insults and not Mrs Black.
  • As Sirius is preparing to make breakfast, he calls out Kreacher's name twice with the express intent of summoning Kreacher to his side. In Half-Blood Prince, Chapter 19 ("Elf Tails"), as well as Deathly Hallows, Chapter 10 ("Kreacher's Tale"), whenever Harry calls out Kreacher's name, his house elf magic compels Kreacher to immediately Apparate to Harry's side, even if Kreacher is too far away to hear the call by normal means. Despite this being an established part of how house elf magic works, and one that Kreacher literally cannot ignore, Kreacher nonetheless does not answer Sirius's summons in this case.

Chapter 23: Christmas on the Closed Ward[]

  • Harry states that Dobby left the Malfoys to give him warnings two years previously, but it was in fact three years previously (two years previously would mean it happened in Harry Potter and the Prisoner of Azkaban).
  • Sirius could have easily just called Kreacher's name in order to force Kreacher to Apparate directly to his side (just like Harry would do in Half-Blood Prince and Deathly Hallows), so he could be questioned about his whereabouts. But Sirius never attempts this simple method of finding him or even considers it.
    • In fact, Sirius had already tried that method in the previous chapter, and it didn't work (see above for details). Which one is the bigger mistake, or if one actually justifies the other, is open to interpretation.

Chapter 24: Occlumency[]

  • If Snape was extracting his sensitive memories purely in order to prevent Harry discovering them (it is unclear why else he might have done so, given that he put them back in his mind immediately after Harry was dismissed), why did he need a Pensieve? He could have just stuck them in a jar. For that matter, why did he temporarily extract his memories at all? Snape was teaching Harry Occlumency, not Legilimency. Unless Snape was expecting Harry to rebound his Legilimency on him? (however, when he does exactly that with a Shield Charm later on, Snape acts surprised).
  • Snape is adamant that Legilimency is not the same as mind-reading, but the etymology of the word 'Legilimens' means literally 'read minds'. Although it is possible that Snape was trying to say that Legilimency can only be used to read one's current thoughts (which most would still call mind-reading) as opposed to poring over the mind as one would a book, Snape's admission that an advanced Legilimens such as Voldemort can even control another's mind directly contradicts this inference (both Snape and Voldemort were unaware that Harry has a piece of Voldemort's soul inside him), as does the fact that the Legilimency Spell, which Snape uses on Harry in this very session, shows the target's memories, not their current thoughts.
    • It is possible that Snape was making things up to give him an excuse to chastise Harry, knowing he wouldn't know any better.

Chapter 25: The Beetle at Bay[]

  • In Harry Potter and the Goblet of Fire, Voldemort mentions only the Lestranges as Death Eaters imprisoned in Azkaban, but here it turns out there were at least ten.
  • How is it possible for Umbridge to sit in on all of Trelawney's and Hagrid's classes as well as teach her own?
    • She may have had a Time Turner, as being a high ranking Ministry official it probably wouldn't have been difficult for her to get one.
  • When Cho and Harry go to Hogsmeade together, she recalls their first match against each other "in the third year." As she is a year older than him it should have been "in your third year."
    • She may have been referring to the third year they had been on their house Quidditch teams, Gryffindor and Ravenclaw, respectfully.
  • 14 February 1996 was a Wednesday. There should not have been a Hogsmeade visit on Valentine's Day.

Chapter 26: Seen and Unforeseen[]

  • When Snape calls Voldemort "the Dark Lord", Harry makes an accusatory statement, claiming to have only heard the Death Eaters call him that, but in Prisoner of Azkaban, Professor Trelawney, who has never been suspected of being a Death Eater, called him that. Even earlier, in Chamber of Secrets, Ginny Weasley wrote a poem that referred to Voldemort as "the Dark Lord". Another year before that, in Philosopher's Stone, Ollivander also called him "the Dark Lord" as he talked about his past achievements.
    • However, Trelawney's use of the title "the Dark Lord" was used largely for poetic effect rather than out of loyalty.
    • It is possible that Harry forgot these examples due to his anger at Snape, or more likely selectively ignored them in favour of accusing Snape of being a Death Eater.

Chapter 27: The Centaur and the Sneak[]

  • Why couldn't Hermione have used the Fidelius Charm to prevent Umbridge from finding out about Dumbledore's Army, with Harry as Secret Keeper?
    • In the Prisoner of Azkaban, Filius Flitwick describes the charm as "immensely complex", so it may have been beyond her abilities. However, she was able to put a Protean Charm on the coins that she gave to the group, which Terry Boot says is NEWT standard, so it's probably not implausible that she may be able to do a Fidelius Charm.
  • It is unclear why Harry was sent to Dumbledore's office when Dumbledore's Army was discovered by Umbridge; he was caught red-handed breaking Educational Decree Number Twenty-Four, the penalty for which is implied to be automatic expulsion (not to mention that, under Educational Decree Number Twenty-Five, Umbridge was sovereign in matters of school punishments and discipline anyway), meaning there should have been no need to run it by the headmaster.
    • It is possible that Fudge and Umbridge wanted to expel Harry in front of Dumbledore, so as to deal a heavy blow to his morale.
  • According to Educational Decree Number Twenty-Four, all of Dumbledore's Army should have been expelled; although the group was supposedly formed and run by the headmaster, it was still a student organisation as defined by the decree, as it was a regular meeting of three or more students regardless of who formed or ran the group. Therefore, Dumbledore's sacrifice should have been in vain.
    • It is possible that the meetings weren't considered regular, as Dumbledore claimed that the meeting that night was the very first. However, that implies that there was to be a series of meetings.
  • When Dumbledore flees, he says to McGonagall “I am not leaving to go into hiding. Fudge will soon wish he’d never dislodged me from Hogwarts, I promise you”. Nothing ever comes of this; the next time we hear anything of Dumbledore is when he shows up at the Battle of the Department of Mysteries.

Chapter 28: Snape's Worst Memory[]

  • It’s indicated that Harry is surprised that everyone seems to know what happened in Dumbledore’s office. But the only possible source of that information is… Harry. Unless McGonagall was telling all and sundry about it, which seems unlikely.
  • Draco Malfoy takes away points from Gryffindor and Hufflepuff when he catches Hermione saying what she really thinks of Umbridge. Then a conversation ensues in which Ernie Macmillan says that prefects can't take away points, even though Percy Weasley takes away points in Chapter 9 of the second book when he discovers Ron coming out of Moaning Myrtle's bathroom. In later editions this is fixed to say that prefects cannot take points away from other prefects, but this clarification is not reflected in the Jim Dale or Stephen Fry read audiobook editions of Book 5.
    • It may also be that Percy merely intended to report the trio's actions to someone who could take those points away, rather than doing it himself.
    • Another possible explanation may be that prefects can take points from students, but not from each other. Prefects have authority over the students, but they are equal to each other. When Draco took points from another prefect, he showed he is above this structure, he has the higher authority now. Limitations of prefects do not apply to members of Inquisitorial Squad.
  • Umbridge wouldn’t have been able to get the information she wanted out of Harry even if she had got him to take actual Veritaserum: he doesn’t actually know where Dumbledore is, and Sirius’s location is under the Fidelius Charm.
  • After Harry has seen his father bully Snape in a memory, he remembers Professor McGonagall saying that James and Sirius were troublemakers at school but no more so than the Weasley twins. This is incorrect. She said in Prisoner of Azkaban that she had no memory of anyone else being so troublesome, and Hagrid said Fred and George could have given them a run for their money.
    • One possible explanation is that McGonagall's earlier statement was a hyperbole. Regardless, it was still not her who said that they were like Fred and George. (It actually just states in the book that Harry imagined them as precursors of Fred and George, so McGonagall didn't really imply it.) A large part of the community also refers to the twins as the successors of James and Sirius.
    • Another possible explanation is that both the pairs were the most known trouble-makers of different decades.

Chapter 29: Careers Advice[]

  • Students get their career advice and brochures most of the way through fifth year, when they’ve long since chosen the subjects they’ll take their O.W.Ls in. So someone could easily discover they hadn’t taken a class they need for their chosen career path.
  • During Harry's talk with Sirius and Lupin in the fireplace, Lupin says that James was 15 years old at the time of what Harry saw in Snape's Pensieve. But this is a mistake as James and his friends were taking OWL Exams which happen in June in fifth year and James was born on 27 March 1960, began attending Hogwarts on 1 September 1971 and James's fifth year was the 1975-1976, so James actually had to be 16 years old in the flashback Harry saw.
  • Both Harry and Sirius seemed to have utterly forgotten about the two-way mirror Sirius gave to Harry before he returned to Hogwarts after the Christmas holidays and told him to use if he ever needed to talk to him. When Harry really wanted to talk to Sirius in this chapter, using the mirror never occurred to him; he instead resorted to an elaborate, but entirely unnecessary ruse in order to use the fire in Umbridge's office, thereby risking expulsion. While it is plausible that Harry simply forgot about it, having dumped it in his trunk because he did not want to use it lest Sirius risk getting caught, and only came across it again after Sirius died (in fact, Harry didn't even look at it until then, so he didn't even know exactly what it was, though Sirius had told him that it is a means of communicating with him), it is unclear why Sirius might have. Yet, he did not seem at all surprised to see that Harry had instead contacted him by Floo powder, and did not mention the mirror at all.
    • McGonagall mentions much earlier on in the book that all magical means of communication in and out of Hogwarts may be being monitored, and Umbridge mentions that the fire in her office was the only exception. It is possible that this included two-way mirrors. If this is the case, however, then surely Sirius would have known (presumably, Dumbledore or McGonagall would have told him) and realised it would therefore be risky to give Harry the mirror. As Umbridge confirmed what McGonagall said after she became headmistress, it is possible that the monitoring did not begin until then, but this is never stated, and the implication is that it began well before Harry received the mirror.

Chapter 30: Grawp[]

  • In the American hardcover edition, Harry and Hermione find seats in the topmost row at the Quidditch match, but when Hagrid comes to tell them about Grawp, he squeezes his way through the row behind them. If Harry and Hermione are in the topmost row, there cannot be a row behind them (corrected in later editions). But there could be a walkway behind the top row.

Chapter 31: O.W.L.s[]

  • It is stated that the practical Astronomy O.W.L. began at 11:00 pm, and Harry observed Venus one hour later (12:00 am). However, Venus can only be observed shortly before sunrise or shortly after sunset;[20] it can never be seen at midnight. Harry was also filling in his star chart with the stars in the constellation of Orion. However, Orion would have set before 11:00pm on that date.[21] Also, Hogwarts is somewhere in the Highlands of Scotland (according to the Prisoner of Azkaban film, it's near Dufftown in Moray); at that latitude, in the two months either side of the summer solstice, the sky never gets completely dark. Sunset in Dufftown on the day of the examination would be about 10pm, and it would still be civil twilight (only the very brightest stars and planets are visible during this phase[22]) at 11pm, the time the examination is supposed to start. Astronomical twilight (the point at which most stars become visible[23]) does not occur at all at that time of year; it never gets darker than nautical twilight (when only the brighter stars are visible[24]).[25] It therefore wouldn't have been dark enough to observe any but the brightest stars anyway.
    • The telescopes may be charmed to show every star regardless.
    • Harry could have mistaken Venus for a different celestial body.
  • During the Ordinary Wizarding Level examinations, Hannah Abbott was doing her Transfiguration practical at the same time as Harry Potter. This is odd since the examinations are done by surname, meaning that Hannah should have finished a while ago, unless she was a rather incompetent student, or unless she had a fit of anxiety in the middle of the examination and had to be calmed, which could take time, and then resume the exam when Harry started his. (It is mentioned that Hannah was already given a Calming Draught on a previous occasion.)
    • That particular exam may have been done by first name, in which case Harry and Hannah would've been doing it at around the same time.

Chapter 32: Out of the Fire[]

  • Umbridge states that it was she who ordered the Dementors after Harry over the summer, in order to silence him. If she was willing to go that far, one would think she'd have made some other effort to silence him, e.g. modifying his memory, but despite ample opportunity she never does, other than the "I must not tell lies" thing which is kind of weak sauce by comparison (and didn't work anyway).

Chapter 34: The Department of Mysteries[]

  • During the trip of Ministry of Magic with his friends, it was left out why there were no Order members there on watch duty, as in the beginning of the book, they mentioned about constantly being on watch duty, day and night.
    • It can however be assumed that, just as the defences on the Department of Mysteries seem to be impaired, the Death Eaters (who had already entered the Department) had removed the watching Order members when they broke in to wait for Harry.

Chapter 35: Beyond the Veil[]

  • Apparently the Death Eaters figured that Harry would be driven to immediately drop everything and go to the Ministry by being shown where the prophecy was, even though they assumed he already knew what it said.
    • This also implies that the Death Eaters got into the Department of Mysteries and set up their ambush every time Harry was shown that dream.
    • And apparently they just assumed he had some way of getting from Hogwarts to London relatively quickly.
  • When Harry told Hermione and Ron about his vision of Sirius in the Department of Mysteries, one of Hermione's objections is that Voldemort would be unlikely to be able to get into the Ministry at five o'clock in the afternoon on a weekday without being seen. But, the Death Eaters (including several Azkaban escapees) got in there with no trouble.
    • Which means that Voldemort should have been able to get in there as well and pick up the prophecy himself.
  • How did Bellatrix Lestrange and the other Death Eaters who’d escaped from Azkaban get their wands back? Hagrid’s wand was destroyed by the Ministry when he was expelled from Hogwarts, and they were going to do the same to Harry’s after the dementor attack, so why weren’t Bellatrix et. al.’s wands destroyed? We know at least Bellatrix’s is her original wand, per Ollivander in Harry Potter and the Deathly Hallows.
    • And the same applies to Sirius's wand.
  • In the UK paperback celebratory edition, the first line of the sentence which runs from page 710 to 711 is repeated, first on the bottom of page 710 and again at the top of page 711. The line reads, "Harry saw the look of mingled fear and surprise on his god-".

Chapter 36: The Only One He Ever Feared[]

  • Ginny reassured Harry that Voldemort wasn’t possessing him because there weren’t any stretches of time he didn’t remember. But when Voldemort does possess him, he consciously experiences it.
  • Dumbledore tells Fudge that the Death Eaters are bound by an Anti-Apparition Jinx. This implies that ordinarily one can Disapparate out of the interior of the Ministry (though presumably not Apparate into it). If that’s the case, why did Bellatrix have to flee to the Atrium in order to escape?
  • Dumbledore sets up a portkey to teleport Harry directly into the Headmaster's otherwise impenetrable office. Earlier, he sets up a portkey in mere seconds to teleport Harry and the Weasleys from his office into 12 Grimmauld Place. This could arguably be considered a serious security risk to Hogwarts. While you cannot Apparate into or out of Hogwarts grounds, portkeys hardly seem like an inferior alternative, especially since, as Dumbledore demonstrates, they can be set up in mere seconds if you know exactly what you're doing. Couldn't Voldemort (during the First Wizarding War when he didn't need to worry about staying hidden) just portkey his way right next to Dumbledore's bed in the wee hours of the morning, and perform the Killing Curse on Dumbledore before he even wakes up?
    • One possible explanation is that, like the aforementioned mistake in Goblet of Fire, only the Headmaster can set up a portkey into or out of Hogwarts grounds. However, even that is not ideal in this case, because in the moment when he set up the Portkey to take Harry back to his office, he is not the headmaster anymore; Umbridge is.
      • Perhaps Umbridge, being the incompetent witch that she was, did not fully understand that the Hogwarts castle itself does not merely bend to the will of whoever the Ministry says is headmistress. Some type of ritual or spell must be performed in order for the castle and its various enchantments to recognise a person as headmistress and grant her the appropriate control over the castle's enchantments. Other teachers, such as McGonagall or Flitwick, may know how to properly install a new headmaster, but they willingly withheld this information from Umbridge. It is presumable that, as evidenced by its gatekeeping of the Headmaster's Office and a statement by Phineas Nigellus Black's portrait, the school itself still considered Dumbledore to be the true head; it therefore permitted him to make a portkey there despite the Ministry's decree to the contrary.
    • It is also possible that Dumbledore is capable of setting up a portkey directly into Hogwarts due to his mastery of the Elder Wand.
  • Dumbledore says of the prophecy, "This is the weapon he has been seeking so assiduously since his return: the knowledge of how to destroy you." But hearing the full prophecy would have given Voldemort no such knowledge, other than the urgency of doing so. Which makes all the effort expended to prevent his hearing it kind of pointless.

Chapter 37: The Lost Prophecy[]

  • When Harry is reminiscing about the time that Sirius watched him play Quidditch, it's stated that he never asked Sirius whether he was as good as James had been, but Sirius did in fact say that he was.

Chapter 38: The Second War Begins[]

  • Snape tries to take points from Gryffindor, but then realises that Gryffindor have none left to be taken and tries to take some other action, which suggests that house points cannot go into negative figures. However, it is strongly suggested in Harry Potter and the Chamber of Secrets, and outright stated in Harry Potter and the Half-Blood Prince (by Snape, no less), that house points can in fact go into negative figures.
    • It's possible that in Harry Potter and the Half-Blood Prince, Snape may have just been trying to be mean and make Harry worried about giving Gryffindor negative house points.
    • It's unlikely, but not impossible that in Harry Potter and the Chamber of Secrets, Gryffindor had been awarded points before McGonagall came to Snape's office to reprimand Harry and Ron. However, it is implied that her reason for not deducting points over the flying car incident was because it happened before term had started, rather than because it would've taken the points total into negative figures.
    • It is also possible, but also unlikely, that house points carry over from one year to the next. If this is the case, however, then Gryffindor must have somehow lost most of the 240 points McGonagall awarded them here by the end of term. (Although, as the Inquisitorial Squad abused their powers so much, it may have been decided not to carry over the points on this occasion as a matter of fairness.)

Harry Potter and the Half-Blood Prince[]

  • Harry's sixteenth birthday happens on 31 July 1996. Looking at any full moon calendar, in that year the full moon was on 30 July. Remus Lupin was recovering from the after effects of his werewolf transformation and it is therefore difficult for him to go to birthday parties. It is said, though, that he was looking "gaunt and grim," so he might have transformed the night before. At Christmas, however, it is stated that Remus Lupin comes over to The Burrow and even uses Bill's bedroom. 24 December 1996 is the exact date of a full moon and, since Lupin was already living with the werewolves, there was little chance he could get the seven days worth of doses of Wolfsbane Potion required to make him harmless. Therefore, on that night he would have been a dangerous transformed werewolf.

Chapter 1: The Other Minister[]

  • Cornelius Fudge meets with the Muggle Prime Minister in the first chapter. At the time that this chapter is set, the real-life UK Prime Minister was John Major, but the book has some inconsistencies with this. Firstly, there are references to the election, but Major wasn't elected when he first assumed office and simply took over following Margaret Thatcher's resignation. Secondly, Fudge refers to the Prime Minister's predecessor as 'he'. Thirdly, he says that the predecessor tried to throw him out the window after the shock of learning about the existence of the Wizarding World from him, but Thatcher would've already heard about it from a previous Minister for Magic and therefore wouldn't have been shocked to meet Fudge, so probably wouldn't have tried to throw him out the window.
    • It is possible that J.K. Rowling was thinking of Tony Blair when writing this chapter, as he was PM at that time, in which case all these references would apply to him. He was elected when he came to power, his predecessor (i.e. Major) was male and Fudge would've been the first Minister for Magic that the predecessor met.
    • It is also possible that this Prime Minister is fictional and not intended to be any real-life figure.

Chapter 2: Spinner's End[]

  • Snape tells Bellatrix he had sixteen years worth of information on Dumbledore to give to Voldemort when Voldemort returned in Harry Potter and the Goblet of Fire. However, the time between Voldemort's original downfall and his return was less than fourteen years.
  • Bellatrix upbraids Snape for not participating in the attempt to retrieve the prophecy, and Snape states that Voldemort ordered him not to, to preserve his “cover”. If he knew about the plan in advance, why didn’t he warn the Order, and Harry?

Chapter 3: Will and Won't[]

  • Once again, the magic Dumbledore was doing at Privet Drive should have triggered the Trace on Harry.
    • Again, he likely informed the Ministry that he was going there, so any magic they detected would therefore be assumed to have come from him.
  • In Harry Potter and the Order of the Phoenix, it’s stated that Kreacher can’t be sent away from Grimmauld Place. But here, Harry sends him to work at Hogwarts.
  • It is made clear that Buckbeak now belongs to Harry, having been passed onto him by Sirius Black's will. This means that legal ownership of Buckbeak transferred from Hagrid to Sirius sometime between the Rescue of Sirius Black and Buckbeak and the Battle of the Department of Mysteries. However, it is unclear how this could have happened: it is unlikely that Hagrid signed Buckbeak over to Sirius, as Hagrid (at least at first) still believed Sirius to be a traitorous Death Eater mass murderer, and Hagrid is stated to have been 'thrilled' to see Buckbeak again after he was put into Hagrid's care due to Sirius's death, suggesting that it was the first time Hagrid had seen Buckbeak since his escape from execution.
    • It is possible that Hagrid did indeed sign Buckbeak over to Sirius; Hagrid stated near the end of the fifth book that he knew Sirius hid in the Cave above Hogsmeade in the fourth book, and presumably knew that Buckbeak was with him, as Hagrid had presumably been told the whole story surrounding Sirius's innocence and his escape from Hogwarts. However, Hagrid's motive for signing Buckbeak over to Sirius is unknown, as is why Hagrid apparently never visited Buckbeak when he had plenty of opportunity to do so since he returned from his Mission to the giant colony, given how happy he was to see Buckbeak again after Sirius's death. Also, given that Sirius was still a wanted criminal and that Buckbeak had been sentenced to death, such a transfer of ownership would likely have piqued the interest of the Department for the Regulation and Control of Magical Creatures, a Ministry department in which the Order of the Phoenix was not known to have had spies in, as well as the Department of Magical Law Enforcement, although in this case, Kingsley Shacklebolt, as the person in charge of the hunt for Sirius, would likely have dealt with any suspicions raised, assuming he was aware of Sirius's innocence when the transfer took place.
    • Another possibility is that the owner of a Hippogriff is considered to be whomever said Hippogriff has the closest bond with. For Buckbeak, this would indeed have been Sirius during their time on the run. If this is the case, then ownership likely transferred to Harry by default due to Sirius's will, for it is unlikely that Sirius specifically left Buckbeak to Harry. However, as little is said about how Hippogriff ownership is governed, there isn't enough information to know anything for certain.

Chapter 4: Horace Slughorn[]

  • Harry points out to Dumbledore that he isn't allowed to use magic outside shcool, and Dumbledore gives him permission to do so in the event that he is attacked. However, in the previous book, it is firmly established that wizarding law permits the use of underage magic for self-defence in situations like these, so Harry shouldn't have needed Dumbledore's permission.
    • It is possible that after Harry's acquittal for unauthorised use of underage magic, the law was changed to prohibit all underage magic, including for self-defence, given that the Ministry (or at least Umbridge) was adamant that no underage witch or wizard would ever have any need to use defensive magic. However, given the Ministry's mistrust of Dumbledore at the time, it seems unlikely that such a revised law would have permitted him to grant permission to do magic outside school.
  • Furthermore, if Dumbledore was allowed to give permission to do underage magic, why didn't he just say he authorised Harry's use of the Patronus Charm during the Attack in Little Whinging in the previous book?
    • It is possible that Dumbledore would have had to justify such permission to the Ministry (otherwise, the underage magic restriction would be rather pointless), meaning that he would have had to convince the Ministry that Harry was indeed under attack by Dementors either way. Therefore, there would have been little point in doing so.
    • It is likely that Dumbledore could only give permission to perform underage magic, not perform magic (underage or otherwise) in front of Muggles. This incident was both.
  • Why did Dumbledore feel it necessary to go outside (let alone all the way to the end of Privet Drive) to Disapparate? In Harry Potter and the Goblet of Fire, it is implied that Mr Weasley Disapparated to The Burrow straight from the the Dursleys' house.
    • That is not outright stated, though, so it is entirely possible that Mr Weasley went outside before Disapparating to The Burrow. However, this leaves the same question we have here.
    • Dumbledore said that Apparating straight into someone else's home is extremely rude; it is possible that he considered Disapparating directly out of someone else's home equally rude.

Chapter 5: An Excess of Phlegm[]

  • This chapter describes Molly Weasley as 'carrying [the Weasley Clock] around the house with her' which seems to contradict its previous description as a grandfather clock. It is also described as usually hanging on the wall and currently atop a pile of sheets in a washing basket. This suggests a change in the author's conception of the clock.
  • On page 101 of the earliest printings, and in the original audiobook editions of Harry Potter and the Half-Blood Prince, Ron mentions that Hermione got ten Outstandings and one Exceeds Expectations for Defence Against the Dark Arts, giving her a total of eleven O.W.L.s. However, since she dropped both Divination and Muggle Studies in her third year, she could not possibly have got eleven O.W.L.s since she was only doing ten subjects — Transfiguration, Charms, Herbology, Potions, Defence Against the Dark Arts, History of Magic, Astronomy, Care of Magical Creatures, Arithmancy, and Ancient Runes. This error was corrected in later editions, in which Ron instead says nine Outstandings and one Exceeds Expectations.
    • This so-called "error" did not even need to be corrected, as it could easily be explained that you are allowed to sit for an O.W.L. exam even without taking the corresponding class. For example, it is established in Deathly Hallows that attendance at Hogwarts has always technically been optional, and yet home-schooled students would likely still need the formal credentials provided by an O.W.L. Rather than correcting this "error" in later editions, it could simply have been said that Hermione volunteered for the Muggle Studies O.W.L. Since she was Muggle born, it would be a waste of time (not to mention rather condescending) to require her and other Muggle born witches and wizards to sit through two years worth of pointless classes just to be allowed to take the O.W.L. exam. This would explain her reading through the career leaflet on Muggle relations, which stated that the only qualification required was an O.W.L in Muggle Studies, and considering it as a career path despite having dropped the subject two years earlier.
    • Another possibility is that Ron was simply exaggerating.

Chapter 6: Draco's Detour[]

  • In the British audiobooks, when the Weasleys, Harry and Hermione are in "Weasley's Wizard Wheezes", the narrator says "patented daydream charms" in a voice that might indicate calling, but it is actually a sign on the product box and there are no quotation marks indicated in the print version of the book.

Chapter 7: The Slug Club[]

  • On page 126 in Chapter Seven on some American Editions it says Chapter One.
  • Malfoy does Petrificus Totalus on Harry and puts his invisibility cloak on him in the hopes that Harry will be sent back to London on the school train before anyone missed him. However, it was established as early as the first book that passengers on the train are typically instructed over the intercom system to leave their luggage and other belongings on board so that the Hogwarts house-elves can collect them and bring them to their respective dormitories. So by all accounts, Harry should have been discovered long before the train began its return trip.
    • It's possible that Malfoy may not have been aware about this fact, though this is unlikely as he ought to be from previous years.
    • Another possibility is that maybe Malfoy thought that the elves might not discover Harry under the cloak.
  • Why didn’t Tonks ask the driver to wait while she searched the Hogwarts Express?

Chapter 8: Snape Victorious[]

  • It's stated that Harry has never appreciated the distance between Hogsmeade station and Hogwarts due to having always covered it by carriage. However, he only did so from his third year onwards, because in his first year he sailed across the lake and in his second he flew with Ron in the Ford Anglia.
  • If Hagrid was visiting Grawp at his cave, making him late to the feast, who brought the first-years to Hogwarts from the station?

Chapter 9: The Half-Blood Prince[]

  • At the start of term feast, Dumbledore tells Quidditch hopefuls to put their names down for selection. For the Gryffindor House, at least, there had never been trials before. Katie Bell also warns Harry against just "picking the old faces," but this had automatically been the case for the five years preceding Harry's sixth year. It is likely Wood was happy with the team for three years, and there was no reason to hold a trial with no spots becoming vacant up until he left. There was no need to hold trials in Harry's fourth year. Angelina Johnson held trials in Harry's fifth year, but only for the parts that needed to be filled in; this could mean that Angelina was happy with the remaining players on the team.
    • This may also be a sign of Harry simply bowing to pressure since he could have chosen to allow those that were already on the team to continue playing but instead chose to take Katie's advice.
    • It is also possible that a new team is chosen only if there's a new captain.
    • Lastly, it could be that Katie was referring to the bad players from the previous year, and simply wanted to replace the players who had weighed down the team.
  • Snape doesn’t accept students who scored less than “Outstanding” on their O.W.L. into his N.E.W.T. Potions class, but apparently has no such restriction when it comes to Defence Against The Dark Arts, as Ron, Hermione and Neville were able to take it having only scored “Exceeds Expectations”.
    • One possible explanation is that he relaxed the restriction due to the return of Voldemort in order to give adequate defence training to as many students as possible.
    • Another possibility is that as DADA was the subject he'd always really wanted to teach, this also made him willing to accept more students.
  • In the sixth year's first Potions lesson with Slughorn, where he offers Felix Felicis as a prize, he states that the vial contains "enough for twelve hours' luck." However, when Harry is considering taking it to get the memory from Slughorn, he tells Ron and Hermione that he would only need to take a bit of the potion, "not twenty-four hours' worth." This error, found only in the American version of the book, is corrected in later editions.
  • It says, "Draco had a look on his face similar to the time Hermione had punched him", but in the novel Harry Potter and the Prisoner of Azkaban, Hermione slaps him. This is true in the film adaptation, though, so J.K. Rowling may have mixed up the events of the films and the books.

Chapter 10: The House of Gaunt[]

  • On page 196 (American Edition), Harry is mentioned going to Dumbledore's office for his private lesson on the 7th floor of Hogwarts. When it is shown that Dumbledore's office is on the 3rd floor of Hogwarts in the 2nd book (Chamber of Secrets/Chapter 12: The Polyjuice Potion), when Harry is taken there by Professor McGonagall.
  • It seems unlikely that Merope Gaunt (or Morfin) went to Hogwarts, but she was able to brew a love potion (or use the Imperius Curse) in order to get Tom Riddle Sr. to marry her. Marvolo doesn’t really seem like the homeschooling sort. Indeed, his abusive behaviour towards Merope is implied to have caused her magical abilities to suffer as a result.

Chapter 11: Hermione's Helping Hand[]

  • First-year students show up for the Gryffindor Quidditch team tryouts, despite the fact that, according to Hogwarts rules, first-years are not allowed to try out for house teams.
    • However, as many other non-Quidditch playing students as well as students from other houses attended the tryouts to be near Harry, it is possible that these first-years followed their example. It is also likely that Harry chose to allow first-years to participate to gauge if they had special talent regardless of age, as Harry himself was exempted from the first-year rule and allowed to join the team due to his exceptional talents as Seeker.

Chapter 12: Silver and Opals[]

Chapter 13: The Secret Riddle[]

  • It says, "... Dumbledore entered the room... It was a small bare room with nothing in it except an old wardrobe and an iron bedstead." A couple paragraphs later, "Dumbledore drew up the hard wooden chair beside Riddle, so that the pair of them looked rather like a hospital patient and visitor."
    • This may have been a pun, since with Dumbledore especially, the term "draw up a chair" is used in a literal sense several times when Dumbledore magically conjures a chair by drawing it. This may have been a covert way of implying this, especially considering Riddle may have missed this action by Dumbledore.

Chapter 16: A Very Frosty Christmas[]

  • Ron states that Fred and George almost goaded him into making an Unbreakable Vow when he was around five. This would mean that Fred and George were around 7 or 8 when this happened. However, in Chapter 2 of this book, it is revealed that this spell requires a wand, even when performed by the exceptionally skilled Bellatrix Lestrange. Fred and George should not have been eligible to have wands until they were 11 years old.
    • It is possible that they might've borrowed a parent's wand.
  • On page 342 of the American version, there is a punctuation error when Molly Weasley says "Have a little purkey, or some tooding...I mean-" to Rufus Scrimgeour. There are no quotation marks in front of the "have" in the statement. This mistake is corrected in later printings.

Chapter 17: A Sluggish Memory[]

  • Apparently the Ministry doesn’t bother to check for memory modification when a suspect makes a prompt confession. See also Harry Potter and the Order of the Phoenix re: Sturgis Podmore.
    • Dumbledore does, however, acknowledge that there is little point in investigating further when someone gives a full and boastful confession.

Chapter 18: Birthday Surprises[]

  • When Hermione is unable to find information about what a Horcrux is in the library, it is remarked that the library had failed her "for the first time in living memory". However, this is not true, for it is not the first time the library had been lacking information they wanted. Two years prior, during the Triwizard Tournament, the trio had scoured the library in search of a suitable spell to help Harry survive underwater for the Second Task, but had been unable to find one. It was even noted then how Hermione was upset that the library had failed them.

Chapter 19: Elf Tails[]

  • On page 415 of the American edition, it says "...McLaggen took a ferocious swipe at the Bludger and missed it." In the original edition "missed" was mistakenly printed as "mishit". This was corrected in later editions.

Chapter 22: After the Burial[]

  • Harry sees Dean, Neville, and Seamus in the common room just before he takes Felix Felicis. But as he is leaving Gryffindor tower a few minutes later, Dean and Ginny are entering through the portrait hole.

Chapter 23: Horcruxes[]

  • Dumbledore says that Voldemort didn't want to wear Gaunt's ring after turning it into a Horcrux, but Harry saw Voldemort wear the ring in Slughorn's memory. Pursuant to Morfin's memory and Dumbledore's explanation, the Riddles were killed right after Voldemort met with Morfin and stole the ring. There would not have been enough time for Voldemort to steal the ring, return to Hogwarts, and then kill the Riddles and make the ring into a Horcrux.
    • However, it is possible that a Horcrux does not need to be made immediately following a person's death; for instance, Riddle could have killed his father and grandparents, stolen the ring, worn the ring at school and then, sometime later, used the damage inflicted on his soul upon murdering the Riddles to make the ring into a Horcrux, at which point he would have stopped wearing it. This would make sense, as Voldemort didn't even know whether it was possible to create more than one Horcrux until this meeting and had already made the diary into one at this point.
  • Dumbledore also says that he believed Voldemort did not want to use the Philosopher's Stone to achieve immortality, but only to regain his body, because it is not the form of immortality Voldemort was after. However, during his return, Voldemort said that the loss of the stone meant that he was not to be assured immortality, suggesting he did indeed intend to use it to further his quest for immortality. As Harry presumably told Dumbledore everything Voldemort had said (indeed, Dumbledore states that Harry told him of a specific statement Voldemort made during his return), Dumbledore should have known this.
    • It is possible that Voldemort did not know exactly how the Philosopher's Stone granted immortality, and thought that a one-off consumption of the Elixir of Life would make him permanently immortal. However, Dumbledore doesn't even consider this possibility (which is strange, considering that Dumbledore readily acknowledges that Voldemort is ignorant or mistaken about a lot of other things); he assumes Voldemort knows exactly how the Elixir confers immortality.
  • Dumbledore says that Voldemort used Nagini to kill an old Muggle man, presumably referring to Frank Bryce. If he is indeed referring to Bryce, then this statement is incorrect: he was killed by the Killing Curse, and his corpse was merely fed to Nagini afterwards, and even this is only implied, never outright stated. If he was referring to someone else, then it is unclear how Dumbledore could have known about it. In fact, it is unclear how Dumbledore knew even if it was Frank Bryce, for Harry never tells him about what he saw when he was linked to Voldemort's mind when it happened, and Harry didn't even remember all the details anyway.
    • It is possible that Dumbledore assumed that Voldemort was too weak to have used magic, and that he therefore had Nagini kill him, but Dumbledore should have known that this couldn't have been the case when he heard about Bryce's spirit coming out of Voldemort's wand, for it could only have meant that he was killed with that wand. Although Harry didn't know the man's name, Dumbledore presumably would have made the link with Bryce's disappearance.
  • Dumbledore states that there might be a Horcrux that once belonged to Rowena Ravenclaw, but does not even mention her diadem, leaving Harry to figure out by himself in the next book that it is the item that might be a Horcrux. It seems unlikely that he would not know about it, given that, in the next book, Filius Flitwick and generations of students clearly did.
    • It is possible that Dumbledore had eliminated the diadem as a possible Horcrux due to the fact that it had been lost for centuries, and he was of course unaware that Voldemort had found it. Still, he could have mentioned it to Harry, so that he would be aware of it.
  • Dumbledore approves of Harry's summary, which included the possibility of a Horcrux that once belonged to either Rowena Ravenclaw or Godric Gryffindor, but Dumbledore had already stated that he believes that the only known relic of Gryffindor (presumably referring to his sword) is not a Horcrux.
    • It is possible that Harry was suggesting that there might be another, unknown relic of Gryffindor.

Chapter 27: The Lightning-Struck Tower[]

  • There are so many ways Draco could have offed Dumbledore and covered his tracks with much less effort. For example, putting someone under the Imperius Curse and making them do it.
  • Exactly how did Draco get the bottle of poisoned mead into Slughorn’s hands such that Slughorn would have decided to give it to Dumbledore?
  • When did Draco put the Imperius Curse on Madam Rosmerta and give her the necklace? It can’t have been during the first Hogsmeade weekend, because he was doing detention with McGonagall, and when else would he have had an opportunity?
  • Draco tells Dumbledore about the enchanted coins that he used to communicate with Madam Rosmerta and says he got the idea from Dumbledore's Army, who used the same method. It's unclear how Draco would've known this, as Marietta is implied to have only told Umbridge that there was a meeting in the Room of Requirement with no further details.
  • Dumbledore tells Draco that he knew Voldemort had ordered Draco to kill him. If Draco had happened to mention this to Voldemort, it would have blown Snape’s cover, as Voldemort would know it could only have been Snape who told Dumbledore.

Chapter 29: The Phoenix Lament[]

  • Harry says that Snape hated his mother because she was a Muggle-born, and Lupin doesn’t say anything. But he has to have known, at a minimum, that Snape and Lily had been friends for at least their first few years at Hogwarts.

Chapter 30: The White Tomb[]

  • Rufus Scrimgeour tells Harry that the Ministry believes he was with Dumbledore when he left the school since there were two brooms on the Astronomy Tower and that "someone Stupefied a Death Eater on top of the Tower after Dumbledore died." However, while Harry did incapacitate said Death Eater, Harry used Petrificus Totalus (the Full Body-Bind Curse) and not Stupefy (the Stunning Spell).

Harry Potter and the Deathly Hallows[]

Chapter 1: The Dark Lord Ascending[]

  • With the death of Albus Dumbledore, Severus Snape should have become a secret-keeper for the location of 12 Grimmauld Place, and thus could have revealed that information to Voldemort. Perhaps Moody's Tongue-Tying Curse was keeping him from disclosing the information, but if that were the case, the casters of the Fidelius Charm could have used the curse more often to prevent the sort of treachery that led to Lily and James Potters' deaths.
    • More likely he did become a secret-keeper, but hid this fact from the Death Eaters due to his true loyalty secretly being to Dumbledore, and since Voldemort did not know Dumbledore was the Secret Keeper, he wouldn't suspect Snape. It is also possible that Snape indeed told Voldemort, but the latter believed it was worthless to go there since the Order would have changed their headquarters.
  • Voldemort takes Lucius’s wand so he can attack Harry without the Priori Incantatem thing happening again. But he’s had Ollivander captive for a year, and in fact forced him to make a wand for Pettigrew; why didn’t he force Ollivander to make him a new wand as well?

Chapter 2: In Memoriam[]

  • It is said that Harry never learned how to repair wounds, but he did learn at least one spell for such a purpose: Episkey, a spell which he even used at least once during Quidditch practice during Half-Blood Prince, Chapter 14 ("Felix Felicis"). Perhaps episkey is only for minor lacerations, but Harry moves past this cut on his hand just by running some water over it and administering some Muggle first aid. If it wasn't a minor laceration, he has no business ignoring it and should have called for an ambulance, and there is no indication that his otherwise untreated cut had impeded his wand hand for the rest of the book, or even that other characters even noticed it.
  • It is said that Harry cannot use magic due to not coming of age for another four days. In chapter six, days have passed since the Battle over Little Whinging, but Harry states the Trace will break in four days.

Chapter 4: The Seven Potters[]

  • As Harry is awaiting the Order, he reminisces about the few times as a boy he was left alone at Privet Drive as the Dursleys went out for fun, mentioning how he would often play on Dudley's computer and sneak tasty treats from the fridge. However, in Harry Potter and the Philosopher's Stone, it is made clear that the Dursleys would never do anything of the sort, fearful that they would come back to find the house in ruins, instead opting to leave him with a babysitter (preferably Arabella Figg).
    • It is possible that he was referring to summer holidays after he had found out he was a wizard, such as in the summer of 1994, when the Dursleys had significantly let up on their abuse of Harry out of fear of retaliation from Sirius. However, by that point, he would likely have had no interest in Muggle entertainment such as television or video games.
  • Right before the Battle of the Seven Potters, Moody explains that the Ministry has restricted the use of Portkeys, Floo Network, or Apparition within the Dursley's house, which is why they had to resort to the elaborate "Seven Potters" ruse to get Harry to safety. However, this restriction only applied to the Dursley's home. They could have just placed a Portkey one foot outside the Dursley's lawn and had Harry jump to touch it, or have Harry grab Moody's arm and jump off the lawn at the count of three before undergoing side-along Apparition. Even if they absolutely had to use the "Seven Potters" ruse initially, the fourteen of them could have just disApparated - side-along or otherwise - the minute they took flight.
    • They were still unable to use magic around Harry due to the Trace. However, as soon as the Death Eaters attacked, magic was being used all around Harry anyway, so why bother with the technicalities at that point?
  • Couldn't Harry and Moody have simply walked together under the Invisibility Cloak a safe distance away from the Dursley's home (such as Mrs Figg's front yard) before undergoing side-along apparition?
    • There are ways of detecting people under an Invisibility Cloak, as evidenced by the Marauder's Map. However, this raises the question of why such methods aren't used more often, such as when the trio appeared at the Hog's Head before the Battle of Hogwarts.
    • It is strongly indicated that the range of the Trace extends for a considerable radius around the house; we know from Harry Potter and the Order of the Phoenix that it extends further than Mrs. Figg's house, at least. That said, they could have walked to her house and got in a car and driven out of Trace range.
  • When discussing the Bond of blood charm protecting Harry at 4 Privet Drive, Alastor Moody refers to it as Lily Potter's, but it was in fact cast by Dumbledore (not to mention that it would be impossible for someone who has sacrificed themself to perform the charm anyway!)
    • However, he could have been referring to said sacrifice, which is what made the charm (which could be thought of as an extension of it) possible.
  • Alastor Moody refers to Harry Potter's motorbike as Hagrid's, but it never actually belonged to Hagrid. Indeed, later on in the chapter, both Harry and Hagrid identify it as Sirius's (Sirius being its original owner, with Harry having inherited it via his will).
    • It is possible that Moody was indeed actually referring to it being in Hagrid's possession. Still, as possessive apostrophes and pronouns are more commonly used to indicate ownership than mere possession, the wording can easily be taken to mean it belonged to Hagrid.
    • It is also possible that Moody assumed the bike belonged to Hagrid, as it was in his possession for so long.
  • Why didn’t Moody have a lookout posted over Privet Drive, like he did when they fetched Harry the same way in Harry Potter and the Order of the Phoenix?

Chapter 5: Fallen Warrior[]

  • Harry says 'What d'you mean? Isn't anyone else back?' but the first apostrophe is missing.
  • Why didn’t Ron and Tonks, and Bill and Fleur, Apparate to the Burrow when they missed their Portkeys, instead of flying there? Indeed, why were Portkeys needed at the other safe houses in the first place?

Chapter 6: The Ghoul In Pyjamas[]

  • If Dumbledore knew about his impending demise a year ahead of time, why didn’t he arrange a new Secret-Keeper for Grimmauld Place?
    • And, why didn’t Moody (or someone) re-cast the Fidelius Charm with a different Secret-Keeper after Dumbledore's death?

Chapter 7: The Will of Albus Dumbledore[]

  • Harry was a Quidditch Seeker for five seasons and Captain for one; how can he not have known that Snitches can’t be touched with bare hands until caught? Indeed, he does release one during practice in Harry Potter and the Order of the Phoenix and gloves are not mentioned.

Chapter 9: A Place to Hide[]

  • Why does nobody notice three people appearing out of thin air on the sidewalk of Tottenham Court Road on a busy Saturday evening? Apparition must have the effect that Muggles don’t notice it.
  • Dolohov and Rowle got themselves disguised and to the cafe in maybe two minutes after Hermione spoke Voldemort’s name. That was quick.

Chapter 10: Kreacher's Tale[]

  • Why was Lily’s letter to Sirius in his childhood bedroom at Grimmauld Place? He hadn’t lived there for years at the time she sent it, and never returned until after he escaped from Azkaban.
  • We know from Harry Potter and the Chamber of Secrets and from later in this book that house-elves can hold their own magically against wizards, so why was Kreacher unable to prevent Mundungus from stealing his treasures?
  • Why didn’t Regulus have Kreacher Apparate him back from the cave after he drank the potion and took the locket? We know house-elves can Side-Along Apparate (or the equivalent) wizards through Anti-Disapparition Jinxes and the like, as Dobby does so in Chapter 23.
  • Kreacher mentions Voldemort refilling the basin with potion after making him drink it, but doesn't mention anyone refilling it after visiting the cave with Regulus. However, the basin had potion in it when Harry and Dumbledore visited and Dumbledore drank it, and it still did when Voldemort came to check on it.
  • We know from Harry Potter and the Order of the Phoenix that Regulus’s sacrifice was about a year before Voldemort fell. But Voldemort had stolen the locket from Hepzibah Smith at least 20 years previously. At the time Voldemort came to Dumbledore to ask for a job, which was 10 years after he stole the locket, his activities and the existence of the Death Eaters were not widely known. But at the time he fell, the First Wizarding War had been going on for 11 years, per Dumbledore in Harry Potter and the Philosopher's Stone.
    • Quite possibly he didn’t turn it into a Horcrux until much later.

Chapter 13: The Muggle-Born Registration Commission[]

  • Harry and Hermione call each other by their real names while freeing the Muggle-borns awaiting trial, rather than those of the people they are impersonating, which is sure to blow their cover.
    • It is possible, given that they were freeing Muggle-borns, that they felt their cover had already been blown, and therefore didn't worry about it. However, this is unlikely, as Harry resumed impersonating Runcorn when he was challenged over freeing the Muggle-borns.
    • Another possibility is that they didn't think it necessary to maintain their cover whilst in the presence of only the Muggle-borns, as it would have been fairly obvious they they were not who they appeared to be anyway.
    • It is also possible that they panicked and momentarily forgot that they were under cover.

Chapter 14: The Thief[]

  • Hermione is afraid to return to 12 Grimmauld Place for fear that she had inadvertently given the location to Yaxley. Harry theorises that Yaxley is also bringing other Death Eaters into the place. However, Yaxley should have been unable to do so, as only a secret-keeper can reveal a location hidden by the Fidelius Charm, and Yaxley would not have become a secret-keeper simply by learning a hidden location from another secret-keeper. He would only become a secret-keeper if the secret-keeper who reveals the secret to him (in this case, Hermione) actually dies.
    • One possible explanation is that the Death Eaters may have deduced that, because Hermione was able to give the location to Yaxley, either she was the original secret-keeper (which is highly unlikely) or she is a second-generation secret-keeper, meaning the original secret-keeper was dead. Even if they didn't know that the original secret-keeper was Dumbledore, the fact that the original secret-keeper (whoever they may be) is dead necessarily means that Snape is now a secret-keeper as well, meaning Voldemort might have likely asked Snape to divulge the information, and Snape complied in order to maintain his cover.
  • It is also a part of Fidelius Charm lore that a secret-keeper cannot be coerced into revealing the protected information; it must be divulged willingly. Therefore, Yaxley should not have been able to learn the secret simply by grabbing onto Hermione and not letting go, as this would not have been voluntary on Hermione's part.
    • However, this could just be Harry and Hermione's speculation based on their limited knowledge on the Fidelius Charm.

Chapter 15: The Goblin's Revenge[]

  • Harry was not able to cast a Patronus while wearing the locket, but Umbridge was. Maybe the locket has less of an effect on people who are already evil.
  • Why didn't Hermione just keep the locket in the beaded bag?
  • Why was it so hard for them to acquire food? Hermione had all of her savings in cash, and both she and Harry grew up in the Muggle world. Some minor disguise work and they could just amble into a supermarket.
  • Ted Tonks uses Summoning Charm on a fish in the river by sayin 'Accio salmon' and it works. However it is said in the Book of Spells and Rowling's Official Site that 'Accio only works for inanimate objects'. A possible explanation is that the Summoning Charm merely causes irreparable harm to living things, such as turning their organs inside out, and since Ted and his friends were just planning on eating the salmon anyway, this wasn't a concern for him.
    • In chapter 18 of Order of the Phoenix, Harry summons a bullfrog during a charms lesson, which proceeds to gloomily come back to him. Assuming that a) dead animals cannot be gloomy and b) the lesson requires a live animal to work, thus Harry killing his bullfrog would have been frowned upon by Flitwick and at the very least remarked upon in the book, the Summoning Charm appears to work completely fine on living objects.
    • Why didn't Harry or Hermione or Ron think of using a summoning charm for anything they wanted to eat?

Chapter 16: Godric's Hollow[]

  • It makes sense that Voldemort stationed Nagini in Godric’s Hollow in case Harry turned up, but having her impersonate Bathilda Bagshot only worked because Harry and Hermione had this (rather far-fetched) idea she might have the Sword of Gryffindor, which Voldemort couldn’t possibly have known.

Chapter 17: Bathilda's Secret[]

  • On approaching Potter cottage, Voldemort is described to have thought that the Fidelius Charm had broken, which was not the case: he had been given the secret, which is not the same thing as breaking the charm.
    • It is possible that a Secret Keeper can not only pass on the secret, but lift the Fidelius Charm entirely. This would also explain how Hagrid and the numerous visitors were able to see and enter the cottage after it had been ruined.
  • It is suggested that the Fidelius charm on Potter cottage broke automatically on James and Lily's deaths. Presumably, one of them was the caster; otherwise, this makes no sense. However, if this is the case, then shouldn't the Fidelius Charm on 12 Grimmauld Place have broken on Dumbledore's death?
    • Unless, contrary to what Sirius suggests in Harry Potter and the Order of the Phoenix, Dumbledore wasn't the caster? But then, who was?
    • The Fidelius Charm on Grimmauld Place wasn't about a person, the secret being protected was the location of the Order's headquarters. Whereas the secret held by Pettigrew was the location of specific people, i.e. James and Lily, so it's not unreasonable to assume that the secret would break upon their death.

Chapter 18: The Life and Lies of Albus Dumbledore[]

Chapter 20: Xenophilius Lovegood[]

  • Ron explains that Voldemort had placed a Taboo on his name, meaning that the location of the speaker is instantly known by the Death Eaters, and also that any protective enchantments the speaker may be under are broken. This explains how the Death Eaters had found them on Tottenham Court Road — Hermione spoke Voldermort's name while they were sitting in the cafe. However, the trio used Voldemort's name several times while they stayed at 12 Grimmauld Place, yet the Death Eaters did not manage to definitively locate them there until Hermione accidentally brought Yaxley back with them after Disapparating from the Ministry of Magic. Although a few Death Eaters did keep watch at Grimmauld Place, with a larger group being present on 1 September, they did not seem to know for certain that the trio was there. They surely would have sent a much larger force if they had known the trio was there. The enchantments placed on 12 Grimmauld Place, which make the location impossible to enter unless invited, were seemingly unaffected by the Taboo on Voldemort's name.
    • However, it is highly likely that the magic of the Taboo may not be powerful enough to break the Fidelius Charm, which is notoriously strong.
  • When Harry, Ron, and Hermione are at the front door of Lovegood House, Hermione says to Harry, "You better take off the Invisibility Cloak, Harry, it's you Mr Lovegood wants to help," and he handed her his Cloak to place in the beaded bag. But after the Death Eaters arrive Hermione says, "Harry give me the Invisibility Cloak, Ron, you're going to put it on."

Chapter 21: The Tale of the Three Brothers[]

Chapter 23: Malfoy Manor[]

  • Why didn’t Harry, Ron and Hermione Disapparate from inside the tent when the Snatchers found them?
  • Why does Voldemort go to find Grindelwald after discovering it was he who stole the Elder Wand from Gregorovitch? (Which we can presume he, like Harry, found out via the photo in The Life and Lies of Albus Dumbledore.) He can't have thought Grindelwald still had it; if he did he wouldn't be in the cell anymore. At that point it ought to have been obvious who its next owner was.
  • Narcissa says that Draco "is home for his Easter holidays." In the next chapter, the sun is described as rising at Shell Cottage in Cornwall, but shortly after this, Harry sees into Voldemort's mind at Hogsmeade, where it is "still dark, because it was so much farther north." However (in the absence of a significant longitudinal difference, as in this case), this sort of thing is only true between the Autumnal and Vernal Equinoxes; Easter occurs after the Vernal Equinox[26] (e.g. on 12 April in 1998), in the other half of the year when sunrise is earlier the further north one goes, thus it should not have been dark at Hogwarts when Harry saw into Voldemort's mind.
    • This is also the first time we hear of students going home for the Easter holiday.
  • Harry, Ron, Luna and Dean could easily have overpowered Draco when he came to fetch Griphook.

Chapter 24: The Wandmaker[]

  • Lupin says that Bill is the Cottage's Secret Keeper, yet Ron was able to tell Dobby about where the cottage was when escaping from Malfoy Manor. However, this is most likely because Ron was aware of the cottage's existence prior to the Fidelius Charm being placed on it, and thus was free to divulge the information on its whereabouts. However according to this logic, Bellatrix Lestrange should be able to tell Voldemort about 12 Grimmauld Place.
    • However, it is possible that the Fidelius Charm does not work on elves, since it is shown multiple times in the books that elf magic works differently with wizard magic.
    • It is also possible that Dobby merely Apparated right outside Shell Cottage for the Secret Keeper, Bill Weasley to lead them in.
    • It is far more likely that the Fidelius Charm was only placed on Shell Cottage after Harry and company arrived. Bill states that they had to get the family into hiding now that the Death Eaters knew Ron was travelling with Harry.
  • If the Weasleys’ evacuation to Muriel's was under the Fidelius Charm with Arthur as Secret-Keeper, Bill should not have been able to tell Harry, Ron and Hermione about it.
  • If Bill is able to be his own home's Secret Keeper, this raises the question of why Lily and James couldn't have done the same.
  • Harry’s wand completely doesn’t work after Hermione accidentally broke it, and Ollivander tells him it can’t be repaired. But Hagrid’s wand had been snapped completely in half when he was expelled from Hogwarts, and it seemed to work fine concealed in his pink umbrella.
    • As Harry later manages to repair his wand using the Elder Wand, it is possible that Dumbledore did the same with Hagrid's.
  • Voldemort abducted Ollivander in order to find out what had happened with his and Harry’s wands in the graveyard. But Harry has to have talked about that in the interview he gave Rita Skeeter for the Quibbler in Harry Potter and the Order of the Phoenix, as it’s a critical part of how he escaped.

Chapter 26: Gringotts[]

  • If Gringotts had been warned that someone might come in impersonating Bellatrix, that would seem to indicate that Voldemort feared they might go after the cup. But it’s clear later that he had no inkling they were after the Horcruxes until he learns about the robbery.
    • Unless Bellatrix sent the warning, without Voldemort’s knowledge.

Chapter 27: The Final Hiding Place[]

  • We’re just going to assume dragons and people riding on one are invisible to Muggles.
  • Why didn’t they Disapparate from the dragon’s back?
  • Harry drips dittany through the singed hole in his jeans to the angry burn beneath, but he has just got changed, so he shouldn't be wearing his singed jeans any more. Not much later in this chapter, Harry returns from an excursion into Voldemort's mind, and is "vaguely surprised" that he is "still wet to his skin", which he should not be since he had got changed into dry robes earlier. Harry may have been so affected by this excursion that he woke up in a cold sweat, but this is unlikely, since Harry has had a lot of experience seeing Voldemort's thoughts by this point, and because the statement implies that Harry's clothing is still soaked.

Chapter 28: The Missing Mirror[]

  • Why didn’t Rita Skeeter interview Aberforth for her book?
    • Possibly she asked and he refused, but you’d think she’d have mentioned that as she did with Doge.
    • Or more likely, she decided the true story might not fit in with her hatchet job on Dumbledore.

Chapter 29: The Lost Diadem[]

  • Neville says Terry Boot got beaten up by one of the Carrows for yelling about the Gringotts raid at dinner, but then we find him in the Room of Requirement.
    • Unless he fled there that very evening as a result and that’s how Neville knows about it.
  • Neville says that the Carrows never figured out how the members of Dumbledore's Army were communicating with each other. But Draco Malfoy had known about the enchanted coins (somehow) and that would seem like a thing he’d have mentioned to them.
  • Why are they still keeping their search for the Horcruxes a secret when they arrive at Hogwarts? They know Voldemort knows about it now, so there’s no reason not to tell everyone.
    • It's possible that they simply felt that others didn't need to know about the Diadem containing a piece of Voldemort's soul, perhaps in case knowledge of Horcruxes became more widespread, increasing the risk of future dark wizards creating them.
    • Also, given that they were in a hurry, it would have taken too long to explain anyway.
  • Harry and Luna head to Ravenclaw Tower together, under the Invisibility Cloak. When Luna reaches out to use the knocker, it says that her floating hand looks eerie because it is not visibly connected to an arm or body. However, Harry was under the Cloak right next to her, so he should still be able to see her full arm and body.

Chapter 30: The Sacking of Severus Snape[]

  • Why would Luna’s Stunning Spell be louder when she cast it on Alecto Carrow than it was in D.A. lessons?
  • In Harry Potter and the Order of the Phoenix, Bellatrix tells Harry that his Cruciatus Curse didn’t work on her because “you need to really want to cause pain - to enjoy it”. Harry remarks that he understands what she meant, after casting it on Amycus Carrow. But we hear of people being forced to cast it on others under duress, which would seem unlikely to work if that was the case.
    • This could imply that Harry wanted to cause Amycus more pain for spitting in McGonagall’s face than he did Bellatrix for murdering Sirius, although it's more likely that he meant that he now understood how to cast the spell successfully.

Chapter 31: The Battle of Hogwarts[]

  • Why didn’t Voldemort hide the diadem in the Chamber of Secrets? Not only is it the strongest connection to his being Slytherin’s heir, it’s a lot harder for anyone else to get into than the Room of Requirement is.
    • Possibly, he couldn’t have got away with taking that much time going into or out of the castle for his appointment with Dumbledore.
    • It is also possible that he did not want to risk the basilisk biting (and therefore destroying) it. However, if the basilisk was asleep, this shouldn't have been a concern.
  • Why did Voldemort think that Harry would go to Ravenclaw Tower? Surely he can't have thought that Harry would think he would have hidden the diadem there, where any Ravenclaw student could stumble across it?
    • Unless he thought Harry would think it was magically concealed? But if this is the case, why wasn't it magically concealed in the Room of Requirement?
      • Maybe Voldemort thought that it didn't need magically concealing, as he assumed that he was the only one to even know about the room?

Chapter 32: The Elder Wand[]

  • Voldemort thought that he was the only one to have discovered the Room of Requirement in its hiding-place form. How could he possibly have thought that, when it was full of stuff that had been hidden over the years?
    • It's possible that Voldemort assumed that the other stuff hidden there is just random junk generated by the room to hide the actual treasure within. Indeed, Harry thought of the other stuff as junk when he went there in the previous chapter in search of the Diadem (though it's possible that this was because he wasn't interested in anything but the Diadem at that time).
    • It's also possible that he was just being extremely arrogant, something that he's known for.
  • Harry, Ron and Hermione had to crawl through the tunnel because they were taller than they were at the time of Harry Potter and the Prisoner of Azkaban, but on that occasion, Lupin, Sirius and Pettigrew didn’t (they just had to duck).

Chapter 33: The Prince's Tale[]

  • When Harry is viewing Snape's memories, he witnesses a scene on Platform 9¾ between his mother and Aunt Petunia, in which Petunia tugs her hand out of Lily's grasp. Her hand is then back in Lily's, and she tugs it out again.
    • Lily may have grabbed her hand again against her will.
  • Dumbledore arranged for Snape to kill him so as to put his loyalty to Voldemort beyond question. That’s kind of pointless if he never told anyone else about the arrangement, thus convincing everyone in the Order that he’d been on Voldemort’s side all along. Not only did it destroy Snape’s usefulness as a spy right when he had become much higher in Voldemort’s confidences, it left him without a defence should he be tried for Dumbledore’s murder.
  • Dumbledore gives Snape two important tasks: Kill Dumbledore, and tell Harry he has to sacrifice himself so Voldemort can be killed. These are as mutually incompatible as it is possible for two tasks to be. How was Snape supposed to get Harry to trust him enough to be convinced he had to sacrifice himself, after making himself Harry’s mortal enemy by killing Dumbledore?
    • He does succeed, but would he have been willing to reveal to Harry his lifelong love for Lily, which is the crucial factor, had he not been at the point of death?
  • Dumbledore asks Snape to cast a Confundus Charm on Mundungus Fletcher, but since Voldemort took over the Ministry after the chase (therefore, Snape was not yet headmaster), Snape shouldn't have been able to enter Hogwarts and go to the Headmaster's Office. Dumbledore also says Hogwarts will be left to the mercy of Alecto and Amycus Carrow should Snape fail Voldemort, but they, like Snape, hadn't been appointed to Hogwarts yet; at this point in time, things were (apart from the crisis due to the death of the headmaster at the hands of one of the teachers) normal as regards to Hogwarts' management and staffing, with no takeovers from Voldemort, as his regime hadn't yet begun.
    • Dumbledore could have showed him a way to enter unnoticed, had allowed him access, or something similar.
    • It is also possible he used the Vanishing Cabinet in Borgin & Burkes to enter the Room of Requirement at night and thus sneak to the Headmaster's Office, or used the same passage through the Room of Requirement that the DA later used.
    • Alternatively, he might have entered at daytime and used a Disillusionment Charm in order to render himself almost invisible and spy on his former colleagues in order to find out what the password for the office is.
    • As for Dumbledore's foreknowledge of the Carrows' reign of terror at Hogwarts, it's possible that their appointment was planned and that Snape knew of it and told Dumbledore.
  • Why was it necessary for Snape to tell Voldemort the date of Harry’s extraction from Privet Drive? Whom is Snape supposedly "so well-informed" by? Even if the Order had known that Snape’s murder of Dumbledore was pre-arranged, he couldn’t possibly have pretended to be a double agent against the Order after that.
    • And, how did Snape find out the date in the first place?
      • Is there another spy in the Order, whom we never hear about? In the Death Eater meeting in the first chapter, he mentions a “source” who also told him the Order believed the Death Eaters had infiltrated the Ministry.
      • Snape does appear to be on go-out-for-drinks terms with Mundungus (which is quite surprising in itself, given Mundungus's stated loyalty to Dumbledore), so he could have Legilimensed it out of him. But why would he do that?
    • Maybe this was all part of the plan to get Snape high enough in Voldemort’s confidences that he would be made headmaster of Hogwarts, but if so it was an incredibly risky plan that put Harry and most of the Order in mortal danger; indeed, it got Moody killed, and Harry only escaped death by a bizarre miracle.
  • If Snape had hit the Death Eater he was aiming for during the chase, he would have given himself away (particularly since he used Sectumsempra).
    • It's likely he was intending to make it look like an accident.
  • Dumbledore wanted Harry informed at the right moment that he (Harry) was one of Voldemort's Horcruxes, but Harry had actually said (and Dumbledore confirmed) this just after the Skirmish in the Chamber of Secrets in Harry Potter and the Chamber of Secrets, although neither used the word 'Horcrux' or 'soul'. Therefore, Harry should have known, and Dumbledore should have known that Harry knew, all along.

Chapter 34: The Forest Again[]

  • The Cloak of Invisibility is stated to be, and have always been, impenetrable and perfect, even though, as mentioned above, it has never been either.

Chapter 35: King's Cross[]

Chapter 36: The Flaw in the Plan[]

  • Why did Draco stay in the castle when Voldemort called a cease-fire, instead of waiting in the forest with the rest of the Death Eaters?
  • It was a huge, huge strategic error on Voldemort’s part to wait in the Forbidden Forest and leave the entrance to the Hogwarts grounds unguarded, thus making it possible for reinforcements to arrive. Because of that error, he and the Death Eaters would have been defeated even if Harry had really been killed.
  • Harry sees Charlie Weasley overtaking Horace Slughorn and in the next page Voldemort is seen duelling McGonagall, Slughorn, and Kingsley; however, Slughorn could have caught up again, possibly due to Charlie being distracted by something else.
  • Harry tells Voldemort that his curses aren’t working on the defenders of Hogwarts because Harry had sacrificed himself (or tried to) to protect them. But that isn’t why Harry tried to sacrifice himself. It’s pretty unlikely that he would have done so if he hadn’t believed it was necessary in order to defeat Voldemort for good.
  • When did the gargoyle guarding Dumbledore’s office get knocked aside? It was undamaged when Harry went up there after the cease-fire started, and the final fight was only in the grounds and the Great Hall.

Harry Potter and the Cursed Child[]

Part 1[]

Act 1[]

  • Scene One and Scene Two take place in the Epilogue: Nineteen Years Later of Harry Potter and the Deathly Hallows. However, there are a few modifications. In Harry Potter and the Cursed Child (Special Rehearsal Edition), the whole Potter family run into the barrier together. In the book, James leaves before the rest of his family. Some lines in the book are not said by the same characters. In the play it's Harry who says "James, give it a rest" while in the book it's Ginny.
    • Albus explains why he doesn't want to be in Slytherin, stating "Slytherin is the House of the snake, of Dark Magic... it's not a House of brave wizards".

Act 2[]

  • When Albus sees Harry's name come out of the Goblet of Fire, there is cheering (albeit less enthusiastic cheering than for Cedric). This contradicts the actual events of Goblet of Fire, where - at the beginning of Chapter 17 (the Four Champions), in the first sentence of the second paragraph - it is stated in no uncertain terms that "There was no applause" for Harry.
  • When Eloise Mintumble time-travelled and changed things, it was noticed by other witches and wizards from the original timeline who went to retrieve her without seemingly time-travelling themselves. When Albus Potter and Scorpius Malfoy time-travelled and changed things, no one from the original timeline knew they could retrieve them. They never mention being able to retrieve them in the same way Eloise was retrieved.
  • When Eloise was retrieved, her body aged the five centuries it had to travel through, and it created paradoxes such as Tuesday lasting two and a half days and Thursday going by in only four hours. When Albus and Scorpius time-travel, the only real consequences was that things had changed and Albus's arm being injured as if it broke twenty years ago and 'allowed to set in the most contrary of directions'. There are no paradoxes.

Part 2[]

Act 3[]

  • Draco Malfoy survived the war and got into a prominent position under Voldemort. This is surprising, considering that Narcissa had betrayed Voldemort and it isn't in his nature to not murder those who have betrayed him and their families.
  • In Harry Potter and the Deathly Hallows, Voldemort murdered Snape so that he could master the Elder Wand before facing Harry in the Forbidden Forest. However in Act 3, Scene 5 Snape is depicted to be still alive and there's no explanation for how Voldemort didn't murder him in the quest for the Elder Wand.
  • Despite being the Headmaster before the war, Snape is now the Potions Master at Hogwarts.

Act 4[]

  • In the play, Polyjuice Potion seems faster to make. In Act 4, Scene 10, Albus proposes that they use this potion to turn into Voldemort because he thinks Bathilda Bagshot may have all the ingredients, and Ron only contradicts him with the argument that they don't have a bit of Voldemort, just like as though the one month of preparation was not an issue when they only have a few hours ahead of them.
    • Both may have assumed that either they could use the Turner again to give themselves time to make the potion or Bathilda would have a potion ready for their use.
  • Harry only had the ability to speak Parseltongue because he was a Horcrux. He never knew how to speak it himself. It only happened because he had a piece of Voldemort's soul residing in him. Rowling stated this to be correct in an interview when she confirmed that Harry "lost the ability and was very glad" when Voldemort destroyed that part of his soul. However, in the play, he speaks it anyway as though he had never lost the ability.

Rowling's Companion Writings[]

  • Quidditch Through the Ages
    • A discrepancy is that although Harry had the book in his first year (1991-1992), there is an event listed that occurred in 1994. It is, however, possible, that the "real" edition was updated. (Although this is unlikely, as the most recent model of Nimbus broom mentioned is the Nimbus 1700 and the Nimbus 2000 and 2001 were released in 1991 and 1992 respectively.)
    • In chapter 1, Gertie Keddle's diary is described as being written in 'badly spelled' Saxon, but there was no standard way to spell words in her time anyway.
    • In chapter 4, a witch named Modesty Rabnott summons a Golden Snidget by using Summoning Charm, but living creatures can't be summoned by this spell.
    • In chapter 7, it says that the first Quidditch World Cup was held in 1473.[27] If the championship is held every four years, this conflicts with the statement in Goblet of Fire that the 1994 championship was the 422nd. If Quidditch Through the Ages is right, the 422nd Quidditch World Cup was actually held in 3161, but if Goblet of Fire is right, the first World Cup was actually held in 306.
    • In chapter 8, it's stated that Quidditch has never achieved widespread popularity in Asia due to broomsticks being rare in countries where carpets are still the main mode of transport. However, Pottermore states that Syria won the World Cup in 1974, which seems unlikely as Middle Eastern countries in particular are said to be especially prevalent in the flying carpet trade.
    • The book says that the European Cup takes place every three years, but it's mentioned to have been held in 1931 and 1956. This is a gap of 25 years, which isn't divisible by 3. It is possible that one or more editions between those dates may have been delayed due to the Global Wizarding War.
  • Fantastic Beasts and Where to Find Them (companion book)
    • In the 'About the Author' section, it is stated that Newt Scamander graduated from Hogwarts, however in the film and screenplay Percival Graves says that he was thrown out for endangering human life with a beast.

Notes and references[]

  1. Differences between editions of the books
  2. Albus Dumbledore Fact file at Pottermore (via the Internet Archive) (see this image)
  3. Harry Potter and the Half-Blood Prince, Chapter 25 (The Seer Overheard)
  4. Harry Potter and the Chamber of Secrets, Chapter 18 (Dobby's Reward)
  5. Harry Potter and the Prisoner of Azkaban, Chapter 22 (Owl Post Again)
  6. 6.0 6.1 Harry Potter and the Half-Blood Prince, Chapter 30 (The White Tomb)
  7. Harry Potter and the Deathly Hallows, Chapter 3 (The Dursleys Departing)
  8. Harry Potter and the Deathly Hallows, Chapter 6 (The Ghoul in Pyjamas)
  9. 9.0 9.1 Harry Potter and the Deathly Hallows, Chapter 7 (The Will of Albus Dumbledore)
  10. Harry Potter and the Half-Blood Prince, Chapter 3 (Will and Won't)
  11. Harry Potter and the Order of the Phoenix, Chapter 35 (Beyond the Veil)
  12. Harry Potter and the Deathly Hallows, Chapter 2 (In Memoriam)
  13. Sunrise and sunset times in Dufftown, May 1993. timeanddate.com. Retrieved on 16 July 2024.
  14. September 1993 — Sun in Dufftown. dateandtime.com. Retrieved on 9 April 2023.
  15. Dufftown, Scotland, United Kingdom Sunrise, Sunset, and Daylength
  16. Sunrise and sunset times in Dufftown, May 1995. timeanddate.com. Retrieved on 22 April 2022.
  17. Sunrise and sunset times in Dufftown, June 1995. timeanddate.com. Retrieved on 5 May 2022.
  18. Harry Potter and the Chamber of Secrets, Chapter 2
  19. Harry Potter and the Order of the Phoenix, Chapter 6
  20. Wikipedia:Venus
  21. Sky in Scotland
  22. Konstantin Bikos. Civil Twilight – Civil Dawn & Dusk. timeanddate.com. Retrieved on 17 April 2022.
  23. Konstantin Bikos. Astronomical Twilight – Astronomical Dawn & Dusk. timeanddate.com. Retrieved on 17 April 2022.
  24. Konstantin Bikos. Nautical Twilight – Nautical Dawn & Dusk. timeanddate.com. Retrieved on 17 April 2022.
  25. Sunrise and sunset times in Dufftown, June 1996. timeanddate.com. Retrieved on 17 April 2022.
  26. "Easter", The Calendar FAQ
  27. Quidditch Through the Ages, Chapter 7 (Quidditch Teams of Britain and Ireland)