Rumor has it that Rex Koury had so little time to pen the theme song that he hastily scribbled it while in the bathroom. It was originally written for "Gunsmoke" when it was a radio show and later adapted for TV.
This show, along with The Life and Legend of Wyatt Earp (1955), helped launch the great era of the TV western. Westerns became so popular on TV that by the end of the 1950s there would be as many as 40 of them airing in prime time.
When the show first aired in the United Kingdom, it was known as "Gun Law". This meant that the opening title sequence had to be re-filmed. Comedy writer Dick Vosburgh was picked to double for James Arness, due his similar height and build.
Dr. Galen 'Doc' Adams: [Festus offers to buy Doc a beer with a silver dollar that he earned from shoeing horses in episode "Whelan's Men".]
Why don't you take that money and invest it in something? Why don't you do that?