In book 4 "Harry Potter and the Goblet of Fire" it says on page 155 First sentance Bung, it should be Brung, they forgot a "r" here is the exact sentence. "Bung him some Owl Treats," said Ron, throwing a packet across to Harry. "It might shut him up." In book 2 on page 132 Hermione says about Moaning Myrtle, "She haunts one of the toilets in the girls' bathroom on the first floor," while in book 4 on page 395 Harry says, "'I suppose there's always Moaning Myrtle,' he said gloomily, referring to the ghost who haunted the girls' toilet on the second floor." According to book 2 on page 133 Nearly Headless Nick's cake says, "Sir Nicholas de Mimsy-Porpington, died 31st October, 1492." Since it's his 500th death day party that would mean that Harry Potter book 2 takes place in the year 1992. However in book 4 it's mentioned on page 25, "chucked his PlayStation out of the window." Play Station officially came out in Japan in December 1994, while at that point in the book it's only August 1994! Book one, page 15 it says Hargrid is Twice as tall as a normal man and 5 times as wide, though in book 4 , pg.179 it says he's 2wice as tall but only three times as wide. I guess he's been on weight loss.
In the Goblet Of Fire, page 178 near the top of the page, when Harry said, "That's not the song it sang when it Sorted us," a capitalization error