Revealing mistake: Kelly is chased by a car and she's running on a field. She falls and she lies on the ground. The image has been reversed (mirror image): as you can notice, the KBEX logo on her jacket is reversed.
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.