- "Harry flicked through the first volume eagerly; he could see it was going to be highly useful in his plans for the D.A.."
- —Harry peruses the first volume of the books[src]
On 27 July, 1997, Harry stored a copy of Elphias Doge's Daily Prophet obituary of Albus Dumbledore in his copy of the first volume of these books, throwing the remainder of the newspaper in the rubbish pile.
Behind the scenes
- This book seems to serve as a direct counterpoint to Defensive Magical Theory, which contained no practical information and referred to counter-jinxes as merely being a name which people give their jinxes when they want to make them sound more acceptable.