DT may be on to something. Consider that Barney suddenly leaves Mayberry for no apparent reason. Why did he leave? Then Opie leaves and moves to Milwaukee and changes his last name to Cunningham. But get this: he changes his first name also (to Ritchie). Now that's quite unusual if not actually weird. Who's he running away from? Then you have Andy who never talks about Opie's mother. Of course, we wonder what happened to her. Is she dead? If so, how did she die? Wouldn't the Sheriff be in a unique position to control the probe into her death? It's all very curious!