Revealing mistake: When Mr Witt rides out of the Zulu camp in a 2 horse cart at the beginning of the movie, just before it exits, you can see it's a stunt double at the reins.
Revealing mistake: When Bond is on Goldfinger's plane - if you watch closely when it shows the external view of the plane in the sky you can see the plane is a model with two wires holding it up. The model plane's design and configuration are also quite different in mid-air. (00:54:20)
Revealing mistake: After Joe (Clint Eastwood) shoots dead the five men in the "small house" there is a close-up shot of one of the dead men lying across the table and his eyes are still open. Joe then pushes him off the table and as his body falls the dead man closes his eyes. (01:02:38)
Revealing mistake: When Col. Franz von Waldheim first encounters Mademoiselle Villard at the museum and walks away from her to turn on all the lights, the wall to the right bounces like canvas as he operates the switch.