Factual error: Phil Lowenstein, the navigator, is hungover when boarding the Memphis Belle. It is obvious to all concerned that he was severely intoxicated the night before the mission. He'd be grounded on the spot and confined to quarters – and this happened a lot in real life.
Continuity mistake: Near the end of the film, when the SEALs are in the inflatable boats heading towards the coast of Beirut, there is a shot from behind showing all the SEALs wearing black diving suits. But when the shot changes to a close up of their faces, you can see they are wearing camouflage fatigues, not diving suits.
Continuity mistake: At the end of the movie, Jack parks the car in front of a palm tree and walks onto the beach. The shot changes while he stands there for a few minutes. As the shot changes back to show him walking off the beach, the car is no longer in front of the tree, nor does he drive by during the credits. I hope he enjoys his walk back to Miami.
Character mistake: G. Peppard holds up a Walther P-38 pistol and calls it a Walther PPK.