Trivia: Yul Brynner, The Man in Black, has only 9 lines of dialogue throughout the movie, only 32 words. In the first saloon scene, Brynner intentionally bumps Richard Benjamin and says, "Sloppy with your drink"; after some silence, Brynner says to the bartender, "Get this boy a bib"; a few moments later, Brynner taunts again, "He needs his momma"; Benjamin finally summons the courage to speak, and Brynner replies, "You say something, boy?" Benjamin says Brynner talks too much, and Brynner challenges, "Why don't you make me shut up?" Whereupon, the two men square off for a duel, and Brynner finally says, "Your move." Later, about half-way through the film, when the Man in Black invades their hotel room, Richard Benjamin overhears Yul Brynner say the line "Not a word" to James Brolin. Even later, Brynner challenges Benjamin and Brolin in the street: Brynner first says, "Hold it," and shoots Brolin dead; Brynner then smiles at Benjamin and says, "Draw."
Trivia: This was Edward G. Robinson's last film.
Trivia: The weapons used against Megalon (the ones that look like satellite dishes that shoot lightning) actually existed, although they were never used in combat. The Japanese experimented with them during WWII.
Trivia: Woody Allen's jazz band played live and recorded the score while watching the film. Woody also played lead clarinet during the session.