"Don Roberto de la Madrid" was played by the real-life Roberto de la Madrid Romandia (February 3, 1922 - March 19, 2010)... this was his only acting role. He was a Mexican elected official who served as governor of Baja California from 1977 to 1983 and was the first American-born governor of a Mexican state. He was a very close friend of John Wayne, who's son Patrick Wayne was the star of this film.
This film was finished in 1957 and was intended to be distributed by Disney's Buena Vista Productions.