Revealing mistake: In the scene near the end when water is filling up the submarine, Kirk Douglas begins fighting with a member of the crew to escape. As Douglas hits him his false sideburn falls off and flies across the screen.
Revealing mistake: Kirk Douglas' stunt double is obvious during the scene of Nemo trying to drown him and his friends as they hold on to the dorsal.
Revealing mistake: The close ups of Ned Land and Conseil in their diving gear as they discover the sunken treasure were obviously filmed on a sound stage - there are no bubbles emanating from their helmets as shown in other actual underwater scenes.
Revealing mistake: When the shark attacks the divers, it is very obvious the shark is a puppet.
