Actor Allusion: As Warren, Jack Burns would occasionally use his stand up trademark of making a statement to another character then saying "huh?" "huh?" "huh?" until the other character shouts an agreement with him to get him to shut up.
The Cast Showoff: Andy's singing was showcased in several episodes, as was Jim Nabors'.
The Danza: Andy Griffith as Andy Taylor and Elinor Donahue as Ellie Walker
Griffith is a native Tarheel. Mayberry is a pastiche of Mount Airy, where he grew up. Nearby to Mount Airy is Pilot Mountain, renamed to Mount Pilot for the show.
Being on the show so endeared the state to Frances Bavier that she moved there (specifically to Siler City) later in life.
Howard McNear (Floyd The Barber) had a severe stroke during the run, and upon returning could not walk or stand on his own. He thereafter was always shown sitting or leaning against an object, and would "walk" across the room off camera. When worsening health required him to leave permanently, Floyd retired and the barbershop became Emmett's Fix-It Shop.
Real-Life Relative: Rance Howard, Ron Howard's real life father, made four separate guest appearances and wrote an episode.
At least two different episodes has Barney desperately wanting the big solo in choir - in one such episode, he loses to Gomer, whose singing voice is much more suitable for the solo; in the other, he's over confident that he's got the solo while the rest of the choir try to find a way to get rid of him without hurting his feelings.
Several early episodes followed the following format: state police and/or feds come to Mayberry to deal with a crime or seek out a dangerous criminal and are frustrated with Andy's country bumpkin nature, eventually ordering him off the case, only to be humbled when he ends up solving the case for them.
What Could Have Been: Originally, Andy was supposed to be the comedic lead with Knotts as his straight man (similar to their roles in No Time For Sergeants, but they quickly discovered it was funnier the other way around: "By the second episode, I knew that Don should be funny, and I should play straight."
Andy Griffith wanted black actors to have prominent roles in the series, but he was barred from this because of the fact that, being the 1960s, many southern stations would have refused to air the show. This resulted in only a very occasional black extra showing up as a background character in very few episodes, with more prominent characters appearing in the spinoff only, and Mayberry didn't get any solid black characters until the RFD sequel/retool series many years later.