Murphy was paid $37,500 for his performance.
There are frequent variations on "Do Not Forsake Oh My Darling" within the musical score.
Spangler is based on William Quantrill, a Confederate soldier/ guerrilla leader infamous for his raids in Missouri and Kansas.
The mother played by Audrey Swanson is addressed as "Mrs. Swanson." Evidently the character wasn't named, so they just decided to use her own.
James Best, who plays Sheriff Scotty, also played a sheriff in The Dukes of Hazzard (1979), Sheriff Roscoe P. Coltrane.