Character mistake: Characters refer to the Dallas and the Red October as "ships," but anyone stationed aboard a submarine would know to call it a "boat."
Character mistake: As the helicopter crewman sees the Dallas surfacing, he says something along the lines of, "Sub at three o'clock". The next shot is from inside the helicopter and shows the sub and a part of the starboard landing gear retracting pod. This shot puts the Dallas closer to one o'clock. (01:24:00)
Factual error: When the USS Dallas submerges to attack the Red October, they rig for battle stations as well as rig for red. On a submarine, rig for red is only for periscope depth operations at night, to allow control room watchstanders eyes to adjust to the darkness topside. No other area on the boat rigs for red. Throughout the movie the lights darken along with battle stations. No naval ship would reduce visibility on purpose in a heightened state. (01:31:00)
Vasily Borodin: I would like to have seen Montana.
Trivia: The Alfa-class submarine Konovalov commanded by Captain Tupolev is named after Soviet Rear Admiral Vladimir Konovalov. In March 1945, he sunk the German luxury liner Goya in the Baltic Sea on its way to Kiel, killing 6220 East Prussian refugees out of 6385.
Chosen answer: They use it to wipe the grease pencil markings off the screens.
We called it "the Duty Roll."