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 correcting is:
|Title||Harry Potter and the Prisoner of Azkaban|
|Original entry||In Harry Potter and the Philosopher's Stone, Marcus Flint is described as a "troll-like 6th year". Yet in the Prisoner of Azkaban, Flint is still captain of the Slytherin Quidditch team. There are only 7 years in Hogwarts and there is no mention of Flint being held back a year or anything else which would explain why he is present in what would be his 8th year at Hogwarts. [J.K. Rowling has acknowledged this apparent discrepancy, and has commented that Flint was held back.]|