Continuity mistake: At the end of the movie where they're at the premiere and John Cusack's confessing that he is in love with Julia Roberts, they cut back and forth from him to her several times. You can see that when he's talking to her and the camera is on him Seth Green is standing to the right in the back, but as soon as they cut to Julia Roberts to see her reaction Seth is suddenly gone with in a split second.
Continuity mistake: When Billy Crystal is running back and forth between the two limousines, when they stop in the middle of the desert, he barely stops talking to Catherine Zeta Jones and Julia Roberts. He starts to run to the next car and the window that was just rolled down while he was talking to them is completely rolled up, yet he hadn't even left the side of the car. The window had been open less than a second before.