Film Noir Influences
The Rifleman had advanced production techniques. It was directed by none other than Joseph H. Lewis, who was responsible for Gun Crazy. Film Noir back in the day was associated with black-and-white and German Expressionism. He used similar techniques for this Western, which made it stand out.
Ralph Moody
Ralph Moody starred in a number of Westerns before he was cast as Doc Burrage on The Rifleman. He later appeared in Bonanza when the show wrapped up. He got his start by playing Heinrich in Rip Van Winkle in 1900. He started out as a personality but got his TV debut in 1949 in the Lone Ranger.