Factual error: Chapter sixteen (Professor Trelawney's Prediction) takes place in June 1994. In the beginning of page 341 (Bloomsbury edition) of that chapter, Harry Potter reads a note from Hagrid and says, 'Buckbeak's appeal - it's set for the sixth.' The night after the Hippogriff's appeal, Remus Lupin is forced into a werewolf form by the full moon, which means that this happened on the night of June 6th, 1994. The web page http://www.hp-lexicon.org/timelines/main/timeline_1990s.html#1994 also backs this up.However, a brief look at lunar phase calendar sites such as http://stardate.org/nightsky/moon/index.php?month=6&year=1994 and http://mysite.verizon.net/bonniehill/pages.aux/lunar/lunar.phases.1994.html definitely shows June 9th, 1994, as a new-moon night, which means that a full moon could not possibly rise three days earlier.

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
More mistakes in Harry Potter and the Prisoner of Azkaban

Trivia: This is the only book in the series in which Voldemort does not physically appear. He is mentioned only in passing in the Shrieking Shack.

Cubs Fan
More trivia for Harry Potter and the Prisoner of Azkaban

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