Helen Crump was supposed to be a one-episode character.
Crump, played by Aneta Corsaut, initially was only supposed to appear in one episode during the third season. This turned into a 66 episode gig – not too shabby, eh?
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The show went out while on top.
Very rarely do you see a television show retire while at the top of its game. The Andy Griffith Show would end while it was still the #1 rated show in the world. Only two other programs have accomplished this: Seinfeld and I Love Lucy.