At the beginning of the story Harry is reading 'A History of Magic by Adalbert Waffling'. However, from the Philosopher's Stone we know that 'A History of Magic' was written by Bathilda Bagshot and that Adalbert Waffling wrote 'Magical Theory'. See more...
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The entry you are marking as a duplicate is:
|Title||Harry Potter and the Prisoner of Azkaban|
|Original entry||After Harry and Hermione return from saving Buckbeak and Sirius, Dumbledore had locked them in the hospital wing. However, it says that Harry and Hermione slipped back into the dormitory, whereas it should be the hospital wing. [A dormitory is "a room containing a number of beds", like the hospital wing. So in fact, JKR is not referring to the Gryffindor dormitory when she writes this - she does mean the hospital wing.]|