The torpedo attack uses footage from the movie 'Voyage to the Bottom of the Sea' (1964)
Don Gordon's character name "Stan Kowalski" is the same as Marlon Brando's character in "A Streetcar Named Desire." Meanwhile, nobody ever seems to call Del Monroe's character "Kowalski" by his first name in all four seasons of the TV series.
In the opening minutes the Seaview's commissioning plaque is shown. She was laid down September 15, 1972,and commissioned July 26,1973.
This episode takes place in the 1980s.