- The costuming was originally intended to be relatively scanty for all the actors in the film, but it was decided the resulting demands on makeup were prohibitive.
- The first choices for the roles of Logan and Jessica were Jon Voight and Lindsay Wagner. The role of Peter Ustinov's character, the Old Man, was offered to James Cagney.
- The character of Francis was originally to be played by William Devane, but he pulled out of the film.
- According to Michael Anderson, Ballard's buttons are United States pennies. Ballard made makeshift buttons out of them because he couldn't find any real buttons.
- An extra makes the Star Trek Vulcan salute when waving to the old man after everyone escapes the exploding city.
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