Corrected entry: Chapter 6: The Journey from Platform Nine and Three Quarters it says that Harry kept to his room. and Hedwig swooped in and out of the open window. Couple of problems with this: at this stage Harry is still in his cupboard (and it is still called "his cupboard" at the beginning of the chapter, and cupboards don't have windows.
Corrected entry: Hagrid says, when Harry's broom is acting strangely during the Quidditch match, that it's "powerful Dark Magic," and that a student couldn't do something like that. In Harry Potter and the Half-Blood Prince, Hermione uses a simple Confundus hex on Cormic McLaggen, which has a similar, albeit not as great, effect. Point is, while it may have been Dark Magic, it is still possible to do with hexes and jinxes.
Correction: The Confundus hex is being used on McLaggen, not the broomstick. Hagrid is pointing out that "powerful dark magic" is need to alter a broomstick to the extent it was in that Quidditch match. Broomsticks have powerful countercurses and counterhexes, whereas wizards have to perform the curse or imbue their clothing to have specific hexes or curses repelled, as displayed in HBP by the Weasleys' Shield clothing line.
Corrected entry: When Hagrid takes Harry to the Leaky Cauldron, he is met by Professor Quirell, who shakes his hand. This should not be possible, obviously, because of the damaging effect Harry's skin has on Voldemort, who is possessing Quirell at this point in time.
Correction: The book says Voldemort enters Quirell's head after the failed attempt to steal the stone from gringots. This part is before the failed attempt.
Corrected entry: In Harry Potter and the Philosopher's Stone we are told that James Potter (Harry's father) was made prefect when he was in Hogwarts, but in Harry Potter and the Order of the Phoenix, it is Lupin the werewolf who was made prefect. As revealed in that book, each house has one male prefect and one female in each year level, so they couldn't have both been prefects.
Corrected entry: On page 99, it mentions that Harry and his classmates have Astronomy at midnight on Wednesdays. But on page 173, it says, "Wednesday night found Hermione and Harry sitting alone in the common room, long after everyone else had gone to bed. The clock on the wall chimed midnight when the portrait hole burst open." They should have been in Astronomy at this time.
Correction: Since the date changes at midnight, it is possible that the "midnight on Wednesday" they are referring to actually occurs on what we would think of as Tuesday night. Therefore, the scene in the common room, which took place on Wednesday night proper, would have been the NEXT night.
Correction: After the first letter from Hogwarts arrives, which Uncle Vernon confiscates, he and Aunt Petunia let Harry have Dudley's second bedroom.
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