Revealing mistake: When the American pilots flying P-47 Thunderbolts are attacked by German fighters, the German planes are really American P-51 Mustangs painted with German markings.
Revealing mistake: When Howard and Curtin chase Dobbs, they pass a dead donkey which is obviously breathing, and the rope used to tie its legs together is visible too.
Revealing mistake: In the scene where the two gangsters take the dead Deputy Sawyer's body out to sea to dispose of it, as the actor is being pushed overboard, he tucks his arms into his chest, as if to prepare for the plunge.
Revealing mistake: In the opening scene when Brandon opens the curtains to let the light in, he is suddenly casting a shadow on to the couch, towards the window, as if the light is coming from behind where the camera is located. (00:04:15)
Revealing mistake: Before the first encounter with the Apache, O'Rourke Jr. is looking out for Indians hiding behind a trunk. When he is being shot at and two bullets hit the trunk you see tiny volcanos erupt which obviously have been filled with explosives. (00:57:00)
Revealing mistake: During the film's climactic end scene, just before the dentist wagon Potter and Jane used to escape the Indian camp blows up, the two protagonists jump off the released horse team to take cover behind a tree trunk on the ground. In that instance, you can briefly see the tall frame and definitely male face of the stuntman playing Jane's part in the scene. (01:30:50)
Revealing mistake: When Mr. Peabody is fishing, it is obvious that he is in a boat on the floor of a studio. Rear-screen projection is used to show the ocean behind him, but while he is standing in the boat and trying to reel in his catch, the boat is absolutely motionless.
Revealing mistake: When Tom is punctured in the rear by the fork that Nibbles is holding, his tail is missing.