Audio problem: Jennifer and the Captain exit the plane and stay there for several minutes while sirens from airport services howl, obviously to help them after such a chaotic flight. However, wider shots show that there's not a single car or person nearby.
Audio problem: When Mickey asks Joe "don't you want to hear my last words?" we hear the sound of a pump shotgun being racked, but Joe has a double-barreled shotgun - there wouldn't be any cocking sound.