I love the movie for an entertaining value, but the reality was terrible.
In the scene when the order goes out to open the torpedo doors for tubes 2 and 4 (which are on the Port or Left side) they actually show the doors for tubes 1 and 3 open (which are on the starboard or right side). When the order goes out to fire torpedoes 2 and 4, they actually show 1 torpedo from each side fire, which would have meant that tubes 1 and 2 or 3 and 4 were fired (or some variation therein).
Also, contrary to popular belief, they don't take fishtanks or dogs out to sea.
They also reported flooding in Maneuvering (which is the room in the engine room, where the propulsion is controlled. This is bogus, because flooding means that seawater is entering the room, and there are no seawater pipes, or areas connected to the hull, in which sea water could enter the room. It was actually some sort of leak.
There is just too much to list here, so if you want to know more, just email me or ask your local navy submariner about just how bogus the entire movie was.