Corrected entry: When the DSRV docks to the Red October, the crew let the October know they are docked by hitting the hatch with a hammer. However, the hammer used is a normal wood and steel hammer, the kind you could buy in any hardware store. Hammers, indeed, all tools on board submarines, are coated with a thin layer of plastic so as to minimize the amount of sound they make if they get banged around.
Corrected entry: Wire guided torpedoes you can steer and provide input to as long as the wire doesn't break. Air dropped, ship fired, and ASROC's don't give you the option.
Corrected entry: Ryan says he doesn't know how long he has been without sleep because his watch is still on London time. If it's still on London time, then provided he can remember the simple fact of what time he got up the previous morning - which would also have been London time - shouldn't he know exactly how long it's been since he slept?
Corrected entry: When Jack is chasing the cook in the missile area he climbs a ladder using both hands, in the next scene he flips himself onto a scaffold with a gun in his hand.
Corrected entry: The scene-setting type at the start of the film identifies the events as happening in November 1984. However, the character Jack Ryan is dropped off at Heathrow Airport by a Range Rover clearly sporting a number plate identifying it as a 'C' registration car. 'C' registrations were not issued until August 1985.
Corrected entry: In the scene where the chief, Jonesy and Beaumont are training, the chief refers to Jonesy as a seaman. In the navy, a seaman is E-3. When the XO takes Jonesy to see the captain about the noise he washed through the computer, Jonesy is wearing a shirt that has a bird and 2 chevrons on it. That means Jonesy is a second class petty officer (that is an E-5).