Throughout the run of the show, it is often said that Jethro is the only literate member of the family. In this episode, however, Jed is told to write a check to the fake corporation by its initials (without being told what the initials are) and is able to spell it out as the acronym (CASH).
The season eight episode "Jed Buys Central Park" has the same plot as this episode, with Phil Silvers as the conman.
It is out of character for Elly May to hold a gun on anyone. Her weapon of choice is a slingshot.
In the location footage of the Clampetts and Jones riding in the truck down the highway, they're all holding on to their hats so they won't blow off. In the immediate close-up shots of them in the truck, none are holding their hats, as it was shot in the studio.
This show's copyright has expired and it is now in the public domain.