Plot hole: When Malfoy gets into trouble while trying to catch Harry with Norbert, Professor McGonagall dismisses his claims as "utter rubbish", and a "cock and bull story." To prove his story was true, Malfoy could have shown her the letter Ron received from his brother Charlie (which Malfoy accidentally received when he borrowed a book from Ron), which detailed their plan to deliver Norbert to Romania.

Cubs Fan
2

Plot hole: On page 56 of the original UK edition, Harry overhears a witch complaining about the price of something as being "seventeen Sickles." There are seventeen Sickles to a Galleon, so a witch who is familiar with the Wizarding world (as she obviously is, given that she knows that price to be unusually expensive) would say "one Galleon" instead. This was changed to "sixteen Sickles" in later editions for this reason. Page 72 in the American version.

Factual error: On page 25, it mentions that the boa constrictor at the zoo winked at Harry. Snakes don't have eyelids at all, so it's impossible for them to wink.

Issabee
More mistakes in Harry Potter and the Philosopher's Stone

Question: Why did Snape have Filch treat his wounds from the three-headed dog? Why not go to Madam Pomfrey in the hospital wing, considering that Snape wasn't really doing anything wrong after all?

Answer: I think Snape wanted to keep what happened quiet while he investigated Professor Quirrell, and Madam Pomfrey was more likely to inform Professor Dumbledore. Filch, who would consider Snape something of a kindred spirit, would not feel a need to report it to anyone, particularly if Snape asked him to say nothing about it.

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