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Rowling has acknowledged in an interview that she messed that up, airily commenting "I've never been good at maths." I guess she was thinking of about 1000 students in the school, but had only named about 40 in Harry's year (counting the girls and the other 4 houses, in addition to the 5 you mentioned).
Another often-noted flaw is in book 3, Prisoner of Azkaban, in which a character changes into a werewolf at a dramatically appropriate, but astronomically odd moment. There's also a known error in book 4, Goblet of Fire, when the order of Harry's parents' deaths is accidentally reversed. This has been attributed to an editing error. Small flaws like these tend to provide fodder for discussions between fans, but I think they don't interfere with the overall enjoyment of the books. The characters behave consistently, which I think is more important (and harder to manage, at least judging by the writings of some authors).
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