I thought this was a very solid episode with a great cast of guest stars and some fairly catchy tunes. Bonus points for not going the stereotypical Beverly Hillbillies/Hee Haw rout when portraying characters from the south.: e.g. the lamentable "Billy Joe Bob" character from season two.
Several people have already mention Dennis Weaver who is superb as always, but it was also a treat to see long time stuntman/actor Red West and the great character actress Susan Oliver.
As a big fan of 60's television, it seems like Susan Oliver made a guest appearance in nearly all of my favorite shows. The Wild Wild West, the Andy Griffith Show, Gunsmoke, the Twilight Zone , and the very first episode of Star Trek; she was everywhere.
I have to wonder if her playing Hank Williams' wife in the 1964 biopic "Your Cheatin' Heart" had anything to do with her getting cast in this episode. Probably just a coincidence.
As for Red West:
Another casting coincidence?