Robert Garland, John Milius, and David Chaber have all contributed to the script of the film.
Klaus Maria Brandauer was the first person to play Remis, the Soviet submarine commander. Two weeks after the film started, he had to withdraw because of other appointments.
When the producer's script faxed to Sean Connery, because the first page of the fax was lost, the producer specially postponed the shooting date by one day in order to allow him time to rehearse.
The USS Dallas crew chose "The hunt has begun", an unofficial slogan as their banner.
Sean Connery’s false eyelashes cost $20,000.
Kevin Costner was initially set to play Jack Ryan.
Many extras who play the crew of the "Dallas" are real submarine soldiers, because it is much more convenient than training actors.
During the filming, some actors who played the crew of USS Dallas cruised on a real submarine. In order to train the role of the Dallas commander, Scott Glen was appointed as the real "commander" of the ship, giving orders to the crew like a real captain.
The underwater model of "Red October" has never actually been launched. This effect is achieved by placing smoke in the "underwater" scene, while performing some digital processing. The submarine is suspended in mid-air, and 12 wires are pulled from the ceiling lattice, so that the model can be turned or tilted when needed.
The crew recruited some crew members from the National Naval Academy in Annapolis, Maryland. In addition to getting paid, these extras can also enjoy a shave for free.
