Continuity mistake: Kelly is talking with Mrs. Brendleberry, when all of a sudden everything starts to move. In the room there is a chandelier, which is shaking. However, if we watch the mirror, we will notice that the chandelier is still.
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.