- According to editor Lou Lombardo the original release print contains some 3,643 editorial cuts, more than any other Technicolor film ever processed. Some of these cuts are near subliminal, consisting of three or four frames, making them almost imperceptible to the naked eye.
- Supposedly, more blank rounds were discharged during the production than live rounds were fired during the Mexican Revolution of 1914 around which the film is loosely based.
- Ernest Borgnine's limp wasn't acting. He broke his foot while filming Split, The (1968) and had to wear a cast throughout the Mexican location shoot.
- Before 'Holden, William' was cast, the role was turned down by Lee Marvin, Burt Lancaster, 'Stewart, James' , Charlton Heston, Gregory Peck, Sterling Hayden, 'Boone, Richard' , and Robert Mitchum.
- Seven identical costumes were made for each main actor. All of them were ruined during filming.
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