Revealing mistake: When Tina kills her father and the dock collapses, one of the logs hits the camera underwater. (00:06:40)
Revealing mistake: Obvious stunt double for Tina as she drops the porch roof on Jason and when Jason grabs her and throws her onto the dock. Her hair becomes a smooth blonde wig.
Revealing mistake: When we see the shot of David's head, you can definitely tell it's a prop head.