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.
Character mistake: When Barr denies giving Jeff's wife a ride, Jeff says this was in the last half hour or so - but considering the time it would take the truck to go to Belle's (5 miles away), the wife to call a tow truck, back from Belle's, then Jeff waiting extra time, then fixing the jeep, heading to Belle's, the time he spent inside, then driving along the road until he saw the truck would in no way be only a half hour...more like an hour or two at best.
Continuity mistake: In the scene where Jeff goes to the washroom in the bank, there is a mor/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.
Other mistake: When Barr arrives at his house it's still dark and his wife points out it's 6:00 in the morning... but considering it's summertime (proven by short shadows throughout the film and the heat in the desert), at 6:00 the sun would already be up or coming up. No dark sky exists at 6 AM in the summertime.