Revealing mistake: During the fight on the train between Bond and Grant, you can spot the stunt double for the Grant character by noticing the bad toupee.
Revealing mistake: When Bond kills Red Grant in the train compartment by strangling him with his own garrote wire, the final shot reveals that the garrote is missing and Bond is faking it.
Revealing mistake: When Bond and Kerim are sailing in the underground reservoir, just before they arrive at the Russian Consulate, there is a closeup of the oar moving through the water. At the bottom of the screen there is a white object moving through the water. It is not clear what it is, but it is not there in any of the other shots of the boat - neither before nor after. It could be the leg of a crew member pushing the boat. (00:33:50)