Continuity mistake: When Harold is at the toilet you can see a shelf behind him with a fire extinguisher and a piece of cloth on it. Also the shelf is by his waist level. A moment later the extinguisher has changed, the piece of cloth is gone, the shelf is by his shoulder level and a clock has suddenly appeared on the wall. It is obvious this is a change of stage scenery. (00:13:15)
Continuity mistake: Jason's left eye is much lower on his face than his right eye, but it sits in a normal position behind the hockey mask.
Continuity mistake: Vera drops Shelly's wallet in the lake. She stands up and tries to reach it. Seconds later it has floated a ways from the dock but remains in the same spot until Vera goes in the water and picks it up.
Continuity mistake: When Vera is picked up by Chris, she brings no luggage with her yet throughout the movie she changes clothes and shoes.