Continuity mistake: How can Ron and Lavender be in a 'prominent corner' of the Common Room when in Harry Potter and the Philosopher's Stone, it says it is a circular room?
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More mistakes in Harry Potter and the Half-Blood Prince More questions & answers from Harry Potter and the Half-Blood Prince
Question: I keep hearing about the mistake where Harry says there is twenty four hour's worth of Felix Felicis in the bottle, when there is in fact twelve. But I checked for it and he says 'all twelve hours' worth'. Is this mistake only in the American edition (I have the British)?
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Answer: This mistake was corrected in later printings, so you may have the corrected version of the book.