Continuity: When the fighter shoots and blows up the truck, there is a shot of the flight attendant (at that moment being strangled by Ray Liotta) sitting in the pilot's seat, looking over her shoulder. It cuts back to the pilot, then back to her being strangled again. Very, very choppy editing.

Factual error: In the shot where the lady passenger boards the Upper Deck to take her seat, she boards through an aft-facing straight staircase, located at the rear of the cabin. On the 747-200, which they were flying, the majority were equipped with circular staircases, and a few equipped with the aft-facing straight staircases, but in both cases, they were located in the front of the cabin, no exceptions.

Factual error: In the shot(s) where the flight attendant approaches the cockpit, it shows an emergency exit door located on the left hand side of the cabin, however on the 747-200, which they were flying, the emergency exit door is located after the cockpit door, and is approximately 1/4 the size as shown. The door shown belongs to a 747-300/400 upper deck door, located in the middle of the upper deck cabin.

Continuity: In the last scene it is raining, but when the camera shows the flight attendant right after the captain salutes her, the rain miraculously stops.

Factual error: When a hole was blown out of the side of the plane, the stewardess is being pushed back by the wind. Surely she would have been sucked out of the plane due to the changes in air pressure?

Continuity: When Lauren Holly's character boards the plane she shows Catherine Hicks her bare, ringless hand, meaning that she broke up with her fiance. Two seconds later you see Lauren Holley in a galley-type closet thing taking off both her leather gloves.  There was absolutely no reason for her to have put the glove back on. 

Continuity: There is a scene where you look down the steps and there aren't any dead bodies, but in the next scene there is someone lying dead on the floor at the bottom of the steps.