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. See more...
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The entry you are changing the wording of is:
|Title||Harry Potter and the Prisoner of Azkaban|
|Original entry||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.)|