JK Rowling’s eagle-eyed fans have spotted a continuity error in one of the Harry Potter books that will be corrected in the next edition — I usually just put up a wiki for readers to post this kind of thing (and typos, etc) so that I can correct it in the next edition.
The author credits Hermione Granger with 11 top exam results in the first hardback edition of book six, Harry Potter And The Half-Blood Prince.
But in book five – Harry Potter And The Order Of The Phoenix – we are told she takes TEN examinations
(via Fark)