"From a novel by Harry Whittington."

Uncredited role: bartender.

In the Old West, marshals, also called the "Town Marshal", were appointed or elected police officers of small communities, with similar powers and duties to that of a sheriff, while federal marshals would work in a larger, possibly overlapping area, especially in pioneering country. The word is still used in this sense, especially in the Southwest United States.

Johnny: I wasn't cut out to be a rancher, Marshal. Now, the way I figure it ... nowadays, a fella's got about two ways he can go in order to amount to anything: the way Billy the Kid took -- and your way.

Billy the Kid (William McCarty, 1860-1881) was one of the most notorious and celebrated outlaws of the Old West.

Lacy Hawks: (singing) Down in the valley ... the valley so low.

"Down in the Valley" is a traditional American folk song.