Continuity mistake: Interior shots of the flying sub sows the sub rocking violently but exterior shots show the sub lying still on the sea floor.
Continuity mistake: The shot from the rear of Kowalski and Nelson shows Kowalski holding the scanner. The next scene Nelson asks Kowalski what is on the scanner and then tells Kowalski to pick it up.
Continuity mistake: During the battle a railing on a pirate ship falls off, only to be seen in the next shot intact, then missing in a subsequent shot.
Continuity mistake: The video set turns on before Admiral Nelson activates the "on" switch.
Continuity mistake: When the four divers exit the Seaview, each has a flashlight. When the reach their destination only three have flashlights.
