Other mistake: Jill is riding a skateboard and she holds a little black bag in her left hand. In one shot, Jill's hand is empty and the next she is holding it again before throwing it at Kelly. (00:45:00)
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.