Reed Hadley played the part of Wild Bill Hickok in this film. Gary Cooper starred as the same character in The Plainsman (1936).
Gene Evans, who plays the drunk in the saloon, also appeared in an episode of Dallas (1978), Home Again (1979), playing Miss Ellie's long-lost brother Garrison Southworth.
Weatherby wears a U.S. Marshal's badge shaped like a ribbon or scroll. Badges for the U.S. Marshals were not standardized across the country until 1941. Until then each district had their own design.
The front exterior of the Robles Ranch with the 6 wide steps was also used in "The Beast With Five Fingers", 1946, as the exterior of the Commissario's quarters, which was supposed to be in turn of the century Italy.
It is mentioned that trains had not made their way to Dallas yet. The first arrival of a train to the city was when the Houston and Central Railroad arrived in 1872.