When Stephanie pays for her ice-cream in the store, she leaves the money on the ice-cream window and Ken collects them. In the next scene, the money are again on the window and Ken collects them again.
When Ken is being interrogated by the Sheriff, the photo of the tire tracks keeps switching between diagonal across the sketchbook, and aligned with the table edge.
When Ken is being interrogated by the Sheriff, the Sheriff is holding 4 photos when viewed from the front (looking down at the front of the photos) , but only has 2 photos in his hands when shown viewing the back of the photos.
Crew or equipment visible
When Ken picks Amy up with his car for the first time, reflection of a camera is visible on the car's window as they start driving away.
Errors in geography
While all the license plates indicate that the film is set in Ohio, palm trees are visible in the background of several scenes.
When the sheriff and the deputy are examining the body in the bathtub, his chest rises and his throat moves as he breathes.