Revealing mistake: When Miss Dempsey lifts up Gripper Burke and spins him around before throwing him out of the window, you can see that Bernard Bresslaw has been replaced by a dummy.
Revealing mistake: Whenever Stupid Bat is flying, the wires pulling him up are visible.
Revealing mistake: After Clint has shot the 3 would-be rapists, he is rifling through the pockets of the dead men. As he checks the pockets of the first guy he shot the "dead" guy in the background is breathing.
Revealing mistake: During the Flak attack on the B25s Arfy notices Orr's plane going down. The scene cuts to a smoking plane going down at a steep angle, but you can see the plane was flying straight and the film turned at an angle as the colors on the horizon are also at a steep angle.