- Some stock footage from other (non-Cinerama) epics were used. The Mexican army marching past the Alamo came from Alamo, The (1960) and a civil war battle was taken from Raintree County (1957). The final scenes of the modern U.S. were from This Is Cinerama (1952).
- No ordinary CinemaScope version was filmed simultaneously with the Cinerama version, resulting in two ugly dividing lines on the non-Cinerama theater prints, video, TV, and DVD versions (indicating the three synchronized film strips originally used).
- The first non-documentary Cinerama film, it was also one of the last to use the old three-camera technique, resulting in two very visible, somewhat distracting, dividing lines in the non-Cinerama print and all TV and home video versions.
- Hope Lange was cast as a love interest for George Peppard's character, but her scenes were cut from the final print of the film.
- A comic book version of "How The West Was Won" was released in conjunction with the film's release, as was the practice back then with all family and children's films.
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