- When first broadcast as a teleplay on TV's "Studio One" on 20 September 1954, the jurors were Norman Fell, John Beal, Franchot Tone, Walter Abel, Lee Philips, Bart Burns, Paul Hartman, 'Cummings, Robert' , Joseph Sweeney, Edward Arnold, George Voskovek, Will West. Joseph Sweeney and George Voskovek were the only two actors to reprise their roles for the film.
- As shooting of the film went on, director Sidney Lumet gradually changed to lenses of longer focal lengths, so that the backgrounds seemed to close in on the characters, creating a greater feeling of claustrophobia.
- Lee J. Cobb makes a reference to Man in the Gray Flannel Suit, The (1956). Both he and Joseph Sweeney (Juror #9) had roles in that movie.
- For many years, only the first half of the kinescope of the live 1954 TV version of "12 Angry Men" upon which this movie version is based (shown in the series "Studio One" (1948)) was thought to survive, and had been in the possession of the Museum of Television & Radio since 1976. In 2003 a complete 16mm kinescope was discovered in the collection of Samuel Liebowitz (former defense attorney and judge) and was also acquired by the museum.
- Jack Klugman played Oscar Madison in the TV version of "The Odd Couple", one episode of which, "The Jury Story", is a spoof of "12 Angry Men".
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