Visible crew/equipment: When the UPS van drives away after delivering the package, camera and crew are reflected on the side of the van.
Character mistake: After Mort finds the two bodies in the truck, he makes a great effort to avoid leaving any fingerprints on the door handle and also on the screwdriver he removed from the one body and takes with him. However, when he's pushing the car towards the cliff, he reaches in the window to grab the steering wheel with his bare hand, leaving his prints all over it and uses his other hand to push the truck.
Revealing mistake: When Mort stops at the gas station to talk to Ted, and he gets out of his Jeep, the key is still in the ignition but there's no dinging from the door being opened (which we know it does from an earlier scene).
Continuity mistake: When Amy's house has been burned, one shot shows the rear quarter panel of a Saab 900 (Note long vent/plastic vent on quarter panel). Later when the car is fully pictured it is a Saab 9-3 (no vent panel in quarter panel).
Continuity mistake: Amy arrives at the cabin and sets down her shoulder bag in the doorway as she searches for Mort. When she realises that Mort has become a homicidal maniac, she runs for her life, but she pauses long enough to retrieve her shoulder bag at the doorway as she flees the cabin. The camera immediately cuts to an exterior shot as Amy exits the cabin and runs for her car, but her shoulder bag has suddenly vanished and is never seen again.
Suggested correction: The bag falls off her right shoulder as she runs down the cabin steps.
