In the decompression chamber, the instrument from which Steve takes a towel is an autoclave, which is used for sterilizing surgical instruments. There really wouldn't be any logical reason for this in the chamber, except simply as a decoration.
The crate on the U-boat is labeled "Gold Bullion." It should have been in German: "Goldbarren."
Despite being on a ship, the water in the fish tanks in Waldridge's lab is not sloshing about in the least.