Richard Harris was originally cast as Flap but was replaced shortly after filming began by Anthony Quinn because of "creative differences".
In the final scene, there is a movie marquee with the words: "Now Showing/Nobody Loves a Drunken Indian". That was the title of the novel on which the movie was based.
Claude Akins plays a character named Lobo. Several years later, Akins played another (unrelated) character named Lobo in the TV series "B.J. and the Bear" and "The Misadventures of Sheriff Lobo".