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.
More trivia for Harry Potter and the Prisoner of Azkaban
Question: When Harry visits Professor Lupin's office the first time, why does Lupin apologize for only having tea bags and not leaves? (I am American and tea is not as popular in all areas of the United States).
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Answer: It's a jokey reference to Harry's Divination classes, where he has been studying the reading of tea leaves; in a recent class, Professor Trelawney claimed to have seen the Grim - an omen of death - in Harry's teacup, and has been regularly predicting his impending doom. By saying he's out of leaves and only has teabags, Lupin is trying to inject some humor into the situation in order to put Harry at ease, so he won't dwell on the Grim or any other death omens.
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