Continuity mistake: In the scene where Milo Hoffman (Ryan Phillippe) and Lisa Calighan (Rachael Leigh Cook) are working together, and Milo's girlfriend Alice Poulson (Claire Forlani) comes to visit, you see Milo and Lisa stand up - Milo says "Hi". Then Milo introduces Alice and Lisa, and Lisa is sitting down. (00:33:00)
Continuity mistake: When Milo, Alice, Teddy, and the rest of the Skullbox team are at a restaurant (just prior to Milo going on the job interview), there are three closeup shots of Alice. In the first two, a man in a red shirt is to her right, but in the third shot the image is reversed; the man is now on her left.
Continuity mistake: In the daycare building, when the bald guy walks in, he picks up the mouse that Milo left hanging. When he puts the mouse back on the pad it is pointing one way, and when the camera shot changes, it is pointed another way.