The reason why Filius Flitwick was short was because he had Goblin ancestory.
The reason why Filius Flitwick was short was because he had Goblin ancestory.
In the books & movies, Bill Weasley was seven years older than Fleur Delacour.
But in real life, Domnhall Gleeson (actor who plays Bill Weasley) is seven months younger than Clèmense Poèsy (actress who plays Fleur Delacour).
George is 13 minutes older than Fred.
WARNING: This fact is useless.
WARNING 2: The bold sentence is the main fact, so you might as well just skip it there.
So, in Philosopher's/Sorcerer's Stone book, in the part where Ron and Harry meet for the first time, there was a part where Ron said: "You never get anything new, either, with five brothers. I've got Bill's old robes, Charlie's old wand and Percy's old rat." (Reference: The Journey From Platform Nine And Three-Quarters Chapter).
So presuming it was Bill's old robes that Ron had been wearing in his first year, in the part where he and Harry changed their robes, it was mentioned that Ron's robes were a bit short for him.
So, it means Bill was shorter than Ron in his first year than how tall Ron was in his first year.
In POA book, (In the Gryffindor versus Ravenclaw chapter) I seem to remember Oliver Wood warning Harry that he found out the Ravenclaw Quidditch team Seeker (Cho Chang) and also mentioning that Cho is a fourth year girl, so it means she was around an year older than Harry since Harry was in his third year in POA.
However in Deathly Hallows, in the part where the Trio returns to Hogwarts to find (and destroy) the Diadem horcrux, Cho was still at Hogwarts. You might say "So what? She's just having her year". But in the Deathly Hallows it was supposed to be Harry's seventh year at Hogwarts, which is the last year you should be staying at Hogwarts. But Cho was an year older than Harry, so, she can't possibly be having her eighth year at Hogwarts, unless Hogwarts' changed their policies when the trio was away or something, Cho would have left Hogwarts by then. Doesn't make sense at ALL.
Some might say that she was only in the Deathy Hallows: Part 2 movie when she telling Luna Lovegood that no one has found the Diadem horcrux in centuries, and that the movies were careless enough to ignore the detail, but I seem to remember there was a line in the books which said (after the trio returned to Hogwarts): "Harry spotted Cho Chang, his oldest and first girlfriend" or something like that.
Just a tiny detail.