Many character actors appear as multiple characters throughout the show. The one who stands out the most to me is Allan Melvin. Maybe someone could start by listing all of his characters.
There are several other examples as well. Let's see how many we can come up with.
Bull! If you watch one of the next few episodes, you will see that they did get one of those. I can't remember which it was, but I remember seeing it and thinking "that crabby ole State Trooper came through!"
Al Checco was in “The Bank Job” and “If I Had a Quarter Million Dollars.”
I was always so surprised Barney didn’t recognize this crook the second time around!
Robert Emhardt from “The Foster Lady” and “Man in the Middle.”
I saw Wally the fillin station owner was also a store keeper in Barney gets his Man, and he was also a member of the city councel but I’m not sure what episode that was.
You’re right Franklin and Keev. He was Ralph the Councilman in “The Mayberry Band.” “Here, here!” “it’s something you say at meeting when you like something somebody said.”
Also, very good catch on Gil, Keev. That is a pretty minor part I had forgotten it.
Gavin MacLeod was in “TV or Not TV” and “The Taylor’s in Hollywood.”
Ruta Lee played a reporter digging up dirt on Andy in Andy On Trial and a Hollywood starlet in The Hollywood Party.