In another episode, Jethro was learning to be a frogman, and Granny thinks he is a monster. But Jethro explains what it is. Apparently, Granny forgot what a frogman was in the few years.
(Granny tells Jed about Mark being a frogman)
Jed: You been at your white lightenin'?
Granny: No, but it's a good idea. Let's have it!
Elly: Pa says if you can understand Jethro, you can understand anything.
Jane: Chief, you are the biggest phony, the lowest fink, the most unprincipled scoundrel who ever lived!
Drysdale: Thanks. I needed that.
(Miss Jane introduces Jed to Mark)
Jed: Granny had him and my daughter Elly halfway down the aisle fore she found out he was married.
Mark: Matthew was awfully upset about that.
Jane: Not as upset as Granny.
Mark: My name is Templeton.
Jane: Of course! Matthew Templeton. Why, you're the man I found in the forest!
Darlene: What forest is that?!