Trivia: This applies to Moonraker too - Jaws' "teeth" were so painful that actor Richard Kiel could only keep them in for a few seconds at a time, which is why you don't get too many long shots with them visible. He only wore them when he needed to open his mouth.
Trivia: Author Peter Benchley has a cameo as a U-boat crewman in the prologue (extended version).
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: More than 8,000 rounds were used for the climactic shoot-out scene.
Trivia: When Hal Holbrook talks to the press after the heat shield separation we see a model Saturn V in the background. An extra stage has been inserted above the S-II second stage and the mission payload appears to have been augmented too.
Trivia: The navy radioman who first receives the emergency signal sent by Captain Gallagher (Jack Lemmon) is played by Chris Lemmon, Jack Lemmon's son.
Trivia: Director John Frankenheimer has a cameo as the television director in the Coliseum control room.