Other mistake: When the stricken airliner is on final approach for landing, both pilots stare intently out the windscreen, never so much as glancing down at the flight instruments. In an instrument landing the pilot must look continuously at the instruments until the copilot reports that the runway is in sight, as that is the only way he can follow the controller's instructions.
Other mistake: Early in the flight, one of the pilots explains to a flight attendant that regulations require that if either of the pilots leaves the cockpit, the remaining pilot must put on his oxygen mask until the other pilot returns (which the remaining pilot is shown doing). However when the bomb goes off with one of the pilots in the rear of the plane, they immediately switch to the cockpit and show the remaining pilot quickly putting on his oxygen mask (which he was not wearing) as he puts out the "Mayday" call.
Other mistake: When they are trying to put together the character of the potential bomber, when he bought insurance, the woman who took his details said she remembered him because he didn't seem to have much money for someone going to Europe, but the bomber had told her he had changed all his US money for Lira, and when she persisted, he said the money was all in big bills, and he had left his cheque book at home - so he did have money.