On the Quest boat, Denise sits between Jonny and Hadji, but when the camera switches to a closer image, Hadji is missing.
The sounds that Hadji and Jonny make while scuba diving can not be made while wearing a breathing regulator.
While scuba diving, Jonny disturbs an octopus who squirts ink in his face. Octopuses don't squirt ink. Squids do.
The door to the room where Race is held prisoner is secured by a plank across the outside, but the door opens to the inside.
Though he may be dressing for company, they're in the Bahamas under full sunlight when Jonny appears fully dressed wearing his familiar black turtleneck. This is inappropriate for the environment and, though a young "cool" kid, he could still be putting himself in danger of a sun stroke.
When Race fires torpedo #1, he presses the torpedo #1 button. When he fires torpedo #2, he presses the torpedo #1 button again, not the torpedo #2 button.