Continuity mistake: After Barry has jumped into the water reclaim the crown, he comes out of the water with a perfectly clean shirt but in the next shot the blood is back on his shirt as expected.
Continuity mistake: Max lies dead in Julie's car covered in crabs. He was hooked very deep under his chin, yet when we see him, the wound is gone.
Visible crew/equipment: When Julie comes home at her mothers house, she looks at her diplomas on the wall. When her mother comes in the room, you can see a reflection of a boom mike in the frame behind Julie.
Deliberate mistake: The film supposedly took place in the Coastal Carolina region. This is a geographically flat area, called a coastal plain. In the beginning of the film, the kids were driving along ocean cliffs, which are not present in the Carolinas. Obviously, this was filmed in California.
Revealing mistake: Portion of the film were shot at an old farm house. The trees were bare, without leaves. Obviously filmed in the winter.
Revealing mistake: When the killer is dragging the girl's body with the meat hook, you can easily see that it is a doll.
Factual error: In the scene where all four people get together after Jennifer Love Hewitt finds a body in her truck, Barry hits Ray with his right hand, which is in a cast. This would cause him a lot of pain, but despite using his injured arm more than once there's no sign of any discomfort.