Revealing mistake: When James Bond has a spider on his arm, one can see he's under a glass plate, and the spider on top of the plate. (00:41:55)
Revealing mistake: The professor has a blowout, but all four tires on the car are fine. (02:04:30)
Revealing mistake: When Atticus kills the mad dog, you can see its hind legs being pulled by someone off screen. (00:43:05)
Revealing mistake: At a certain point we see the arid, dry Santa Monica Mountains of Los Angeles in the upper left of the picture with a huge high-tension electrical tower at the summit. The film is set in 1912 in Iowa, a green, rainy state which is also completely flat, with no mountains. Then again, we see the arid, dry Santa Monica Mountains in the upper right. (00:08:27)
Revealing mistake: There is a short section where a U.S. soldier hops a rugged looking stone wall in France. As he goes over the wall, it moves back and forth a bit as if made of styrofoam and wood.
Revealing mistake: When the blonde stripper slaps the brunette slapper, for calling her "leftovers," in the closeup of the brunette being slapped, the hand is that of a male; very rough and hairy, and not the blonde stripper's.
Revealing mistake: Near the beginning, after the corporal has burned his finger and tells the other corporal that Lawrence is balmy, O'Toole begins to run up the stairs to meet with a general. After O'Toole is out of view of the camera, you can tell he has stopped running up the stairs by his shadow on the wall not moving, because he knows that the director is about to shout "cut".
Revealing mistake: When Ransom and Hallie Stoddard are riding the train back to Washington at the end of the film, pay attention to the view out the window as Hallie responds to Ransom's suggestion of returning to Shinbone. When the conductor brings the spittoon and talks to them, the same exterior footage repeats from when Hallie started to speak. (02:01:30 - 02:02:15)
Revealing mistake: Godzilla just reached the coast and is fighting a horde of toy tanks. When she sets foot on the base and swings her tail at the control tower, you can see that the tower is pre-broken in the middle, already all cracked and ready to fall apart at the center when Godzilla barely touched the tip. (00:15:10)
Revealing mistake: When a girl is shot in the back with an arrow she falls on her face. When she's turned face up, the long arrow is gone.