The original concept of the show was for Andy to be the show’s resident comedian, a sort of homey Will Rogers-type cracker barrel philosopher. Andy would comment and make jokes about the show’s other characters. But after seeing Don Knotts in the first episode, Andy knew Barney would be the show’s resident “funny man” and Andy would be his straight man.
Because he had suffered a stroke, Howard MacNear (who played the barber) had trouble standing. A special stool was built to make it appear Floyd was standing when he was in fact half-sitting or leaning. Floyd was also often seen sitting in his barber chair or sitting on a bench outside his shop. (Howard’s stroke also left his left side paralyzed. Watch Floyd closely in later episodes, you’ll notice he will never move his left hand.)