Trivia: When Tony Manero's father slaps him on the back of the head during an argument at the dinner table, Tony replies, "Would you just watch the hair? You know, I work on my hair a long time and you hit it! He hits my hair!" John Travolta ad-libbed this line. Director John Badham thought it was so perfect for the character of Tony Manero that he decided to leave it in the film.
Trivia: When Doc Terminus is tied to the harpoon shot from the cannon and goes through the building roof, you can hear a "Goofy Holler."
Trivia: The character of umbrella wielding Major Harry Carlyle was inspired by real life Major Allison Digby Tatham-Warter, who said that he 'carried the umbrella because he could never remember the password, and it would be quite obvious to anyone that the bloody fool carrying the umbrella could only be an Englishman'. Unlike Carlyle in the film, Major Tatham-Warter survived the battle and was captured by the Germans. He escaped, and in the weeks that followed, aided by Dutch Resistance, helped hundreds of other soldiers in similar situations to be evacuated to safety.
Trivia: During the second to the last scene of the movie, Barbara Carrera is trying to help Michael York push a rowboat into the ocean from the shore. As one of the manbeasts runs into the surf towards them, Barbara Carrera screams "Michael, look out"! Michael York's name in the movie is Andre Braddock!
Trivia: In this movie, Penny Irving plays Young Mr. Grace's new secretary, Miss Nicholson. In the TV series, she was called Miss Bakewell.
Trivia: Original titles for the film included "Free Popcorn" and "Closed for Remodeling."