Continuity mistake: When Severus talks to Narcissa and Bellatrix in his house, he states that he "had sixteen years of information" about Dumbledore when Voldemort returned. However, Voldemort returned in June 1995. Snape would only have been teaching at Hogwarts (and supposedly spying on Dumbledore) for not quite fourteen years at that point, as he started in 1981.
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More mistakes in 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)?
Answer: This mistake was corrected in later printings, so you may have the corrected version of the book.