Continuity mistake: When George is talking to two elderly neighbors there is a mailman in the background dropping off a letter in a mailbox. A fraction of a second later he is already walking in the middle of the road.
Deliberate mistake: In the beginning of the film with Coleen after George gets up, also in several other "morning" shots, the sun is always shown near the horizon or reflecting off the ocean. On the west coast this would make this the evening.
Trivia: Hayden Christensen didn't like wearing the heavy makeup and jewelry required for this movie. He complained that he was made to dress as adults saw goth teenagers and not as they actually were, which is why his character is so overly made-up, especially toward the beginning.