Capt. Crane crashes the Seaview on the ocean floor, but the interior remains undisturbed by the obviously hard landing.
When Captain Crane goes into the Small Arms Locker the first time, the sign on the door is straight. When shot from inside the room, the sign showing SMALL ARMS LOCKER is slanted at an angle.
Visible wire on dangling fire extinguisher.
The Seaview rests on the still ocean floor, yet, somehow, there's enough jostling going on to rock a loose fire extinguisher about on its wall mount.