Goofs

During the home invasion scene, the boy can be seen breathing after being killed.

In the opening shot, the "dead" woman takes a few breaths towards the end of the shot, as seen by the movement of her stomach. The filmmakers point this out in the DVD commentary, and show additional footage in the outtakes.

When the lady in the blue sweater leaves the mall, she gets into her Black car, puts the car into reverse, backs up, then continues forward without putting the car into Drive.

Just after Becky buys a newspaper and sits down to read, a vehicle goes past and we see a camera on a tripod to the far right of the shot.

(around 46 min.) When the high school kid gets into Otis' car to share a blunt, the operational camera crew is vaguely reflected on the car door as it swings open.