After the brawl at "The Bird Cage Cafe", everything that was busted up, is all fine, as if nothing had happened.
Gale Sondergaard loses an earring, which appears and disappears in succeeding shots.
The salvage ship would not have loose items of furniture and other objects in cabins and other rooms. During rough weather, these would be thrown about and could damage the cabin and injure people, Furniture would be fixed to the floor and / or walls.
The divers obviously squat on their knees as they descend into the water of a studio tank.
The sky in back of a boat, an obvious backdrop, has visible creases.
There was supposedly $3 million worth of gold in the chest. In 1943, gold was valued at $33.85 per troy ounce. Doing the math, this indicates that the $3 million in gold would've weighed a little over 6,000 pounds - more than 3 tons. Yet, in the film, this huge weight of gold was lifted onto the salvage boat with a single thin rope, and transported ashore with little difficulty once they placed the chest of gold in a small rowboat,
The wires that operate the underwater diver marionette can be seen.