Towards the end of the film, when the aliens leave, Bob's cardigan is buttoned up. As he passes through the door it becomes undone; it is buttoned up again when he goes back into the house.
When Allen is about to jump from the Dragon Rapide aircraft, the shot goes to the cockpit of the aircraft and the altimeter clearly indicates 0 ft. The radio conversation states the plane is at 11,000ft but the shot from the ground show an aircraft at only about 2000ft and the reverse shot from the AC the height seems even lower.