Continuity mistake: In the beginning of the movie Jeff and his wife were moving to San Diego from Massachusetts. Well, they were driving in their new Jeep (with Massachusetts plates) through Arizona. When Amy comments about how fast Jeff is driving, the camera shot shows the speedometer at 80 mph and the odometer shows the Jeep has only 245miles. That must be a new record from MA to AZ..... (Note: not visible on DVD version of film.)
Continuity mistake: When Jeff and Amy run out of the barn and to the truck, there is an angle where it shows the sun already above the horizon, but then the same angle is shown seconds later with Billy chasing them and now the sun hasn't quite risen yet. This is out of sequence.
Continuity mistake: When Jeff goes to the washroom in the bank, there is a mop/broom handle leaning against the corner of the wall by the door. After he rummages through the cupboard looking for a weapon, the handle is gone.