Corrected entry: During the bar scene (at the Moor Bar)...Cuba Gooding and Robert DeNiro challenge each other to holding their breaths in Mark V diving helmets filled with water. The Mark V diving helmet is not designed to hold water in like that. The water being put into the helmet would rush out all over their shoulders. You would need a neck-dam to accomplish that feat. Mark V's were never made with one. Only the newer helmets such as the Miller, the Superlite 17 or the Superlite 27's have them.
Corrected entry: The aide is first referred to as "Lieutenant Hanks" by the ship's captain. Then, he's shown wearing rank insignia of a single silver bar on his collar. In the US Navy, that's the rank of an Ensign. As a lieutenant in the Navy, he should be wearing two joined silver bars (same as an Army Captain). (00:16:25)
Corrected entry: Cuba Gooding plays a Boatswain's Mate, but wearing his rate on his left sleeve. Boatswain's Mate was a "right arm" rate; the emblem should have been worn on his right sleeve.