Continuity mistake: Barbara is in a phone booth and she is talking to Dr. Redmont: her nails are not painted. Then she presses a button of a device: the close shot of the hands reveals that her nails are painted. (00:03:30)
During the scene in the Sheriff's car, after the Angels choke the Sheriff and Deputy, they lose control of the car. It goes off the road and a ramp is seen, hidden by some trees, that the car goes off to end up in the swamp.