Replays of the ground-to-air transmissions heard when the investigators listen to the tapes, and later during the flight to simulate the crash conditions, do not accurately replay what was originally heard, with sudden pauses or missing portions of transmissions in each scene.
When the plane crash at the beginning of the movie is shown, the cockpit of the plane tumbles dramatically towards the viewer. However, when the crash investigation team is looking at the wreckage, the captain's coffee cup remains just where he left it.
The aircraft used for this movie - cobbled together from a Douglas propeller airliner - would be impossibly tail heavy with tail-mounted engines. The wings are too far forward. If it managed to achieve flight, it would instantly stall and crash.