Harry Potter and the Chamber of Secrets - 7 mistakes

Continuity: In the second book 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.

Continuity: Dumbledore tells Harry at the end that Lord Voldemort is the last remaining ancestor of Salazar Slytherin. But ancestors are in the past - he means Voldemort is the last descendant of Salazar Slytherin. Not a mistake Dumbledore would have made. (Corrected in later printings.)

Continuity: At Nick's 500th deathday, which occurs on 31 October (clearly stated in the book), it says that he died in 1492. Therefore, the book takes place in 1992, and since Harry is currently 12 years old, he was born in 1980. Yet in the first book, Harry mentions that his 11th birthday was July 31st, on a Tuesday. That date was on a Wednesday in 1991, when he's supposed to have been born.

Continuity: When Harry causes Goyle's Swelling Solution to explode in class, it showers the whole class. But a few moments later, only half of the class approaches Snape for the antidote.

Continuity: In the back of the paperback edition, there is a preview of book three, where it says Harry blows up his Aunt Petunia. It should say his Aunt Marge.

Continuity: After Harry, Ron, Fred, and George arrive at the Burrow after getting Harry, Mrs. Weasley shouts at Fred first. "You will not," snapped Mrs. Weasley. Then she says "And you two," glaring at Ron and Fred. It should say George, for she has already yelled at Fred.

Continuity: The Hogwarts' equipment list mentions the Lockhart book "Wanderings With Werewolves," but later, Lockhart refers to the book as "Weekend With a Werewolf". (May be corrected in later editions of the book).