This is probably old hat to all you folks, but here is my one piece of Mayberry trivia for those few that haven't heard it...the actor playing Floyd suffered a stroke midway through the series and lost the use of his legs, so after a certain point in the run, you only saw him sitting...sitting in the barber chair, on the porch, on a box, pretty much anywhere you could rationalize it. Like FDR, it was kept as a secret.
I did know that Mayberry trivia. That same actor who played Floyd actually played a disabled person in a movie called "The Fortune Cookie." This movie is where Walter Matthau plays a trial lawyer who tries to help out his buddy, Jack Lemmon who plays a CBS cameraman, claim monetary damages, after Lemmon gets battered around at a Cleveland Browns football game. The "Floyd" actor appears in one scene as one of Matthau's clients.
They also rigged a special high-seat for Howard McNear (Floyd) so he could appear to be standing--usually while he was cutting hair--when he was actually sitting.
I believe he lost the use of an arm, as well, so I'm trying to recall how he faked cutting hair. His speech was somewhat slower after the stroke. What a bunch of great folks were on this show, all of them.