If you could change one thing in book one, what would it be?
Okay, this is really weird, but I wish Hagrid hadn't give Dudley a pigs tail. It feels like a fairly cruel addition to the book. If I remember correctly, in the book Hagrid did it not because Dudley was eating Harry's cake (movie) but because he was angry at Mr. and Mrs. Dursely. Which means he's punishing Dudley for the parents he has just like Harry was punished for being the son "those people". I know the scene is funny and uses the magical cliche of turning people into animals, but I wish Hagrid would have reversed it or something. Then maybe the scene wouldn't feel tainted to me and it would still leave intact the ongoing jokes about it in the series.
This is only something that started bothering me recently. I guess that is why adults shouldn't analyze children's books, I take things too seriously.