Revealing mistake: The rattlesnake Hogan kills in the mission's ruin is fake: Its frontal part moves unnaturally stiffly, and its tongue does not flicker. (00:16:40)
Revealing mistake: Whenever Stupid Bat is flying, the wires pulling him up are visible.
Revealing mistake: When Jenny calls Oliver's parents' phone from their rotary phone, her fingers only change slots once. Jenny is supposed to be dialing 1-338-3434, but she really only dials 1-333-3333. (00:53:50)
Revealing mistake: When Miss Dempsey grabs hold of Gripper and sends him crashing into a table at Mr Snooper's house, you can see that it is not Bernard Bresslaw but his stunt double.
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.