Revealing mistake: The B17 that crash lands in the beginning appears quite realistic, until during a head on shot when you can see daylight through the clear nose from a window in the back of the plane. This shows it to be model as in the real plane bulkheads would block this from happening.
Factual error: They hold a huge dance in the hangar at night, and Dennis leaves to walk to the Memphis Belle through the hangar doors, which are wide open. The whole flight line, tarmac and hangar are bathed with light - on a US Air Force base in East Anglia during the height of the German bombing offensive. Haven't they heard of the blackout? Why not just paint a big fluorescent sign on the runway saying 'Please Drop Bombs Here'?
Sgt. Virgil Hoogesteger: I know exactly what I'm gonna do.
Richard Rascal Moore: Oh God, Virg, if I have to hear one more word about that stupid restaurant.
Sgt. Virgil Hoogesteger: It's not stupid! At least I've got a plan! What are you gonna do after the war, huh?
Richard Rascal Moore: Come to your restaurant and rob it.