Trivia: Paramount Studios essentially rented a US submarine to be in the movie. The USS Houston (SSN 713) played the USS Dallas and the surface scenes were filmed off of Long Beach, CA and Port Angelas, WA. Two crewmembers off the Houston were actually given very small speaking parts in the movie.
Trivia: When the agent pulls from the computer record Richard's file, an alias listed is "David Putnam - Columbia Pictures", employed from 06/04/1973 to 02/01/1975. That's an obvious reference to producer David Puttnam (two Ts), who had a brief stint as head of Columbia Pictures in 1986-87, not making many friends in the then Coca-Cola owned production company. (00:12:50)Sammo