Issabee

Continuity mistake: Before Harry and Hermione go back in time, it mentions that Buckbeak is tied to a tree. But when they go back in time, Buckbeak is tied to a fence.

Issabee

Continuity mistake: Arthur Weasley says that Ron and Harry have both been in the Forbidden Forest twice. Harry has gone in twice, but Ron has only gone there once, in The Chamber of Secrets while following spiders. (This differs from the movies when Ron is given detention instead of Neville).

Issabee

Continuity mistake: When Harry is buying his books at Flourish & Blotts, it mentions that he is being served by the manager. But when Harry was staring at the book 'Death Omens', it says that he is being served by the assistant of the store. (Corrected in later versions.)

Issabee