Character mistake: In the very first scene in the film, the magazine covers are flashing up. There is an article called 'How to get a better bod in 5 days.' If you read the beginning of the article it says 'It Can Done.'
Continuity mistake: When the guys are looking at Andie's purse on Ben's desk, the two handles are sticking straight up but the close up shot shows the front handle folded over, and then the next wide shot shows them both up again.
Ben: Hanging with her for 10 days is gonna be no problem.
Tony: Right. That's only nine days longer than you've ever spent with any other chick, huh?
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Answer: No.