Opie develops a crush on his teacher, Ms. Crump, and Andy sees that the only way to get Opie to forget about it is to admit to him that he and Helen are an "item."

New height and weight requirements go into effect for all law enforcement officers, which threatens to put Barney out of a job unless Andy can figure out a way to throw around some much-needed weight.

Otis is talked into suing the county by a shady lawyer, thinking Andy will support his efforts to attract more money for the courthouse. To his surprise, Andy decides to fight the case.

Barney sets up a sting operation to catch a crook who may be returning to Mayberry for some stolen loot and ends up arresting an undercover FBI agent instead. But a suspicious Andy realizes Barney's operation may not have been as far off as he thought.

Andy feels responsible when a banjo player loses a job at the carnival, and tries to help him get back on his feet. The man only succeeds in making a mess of things and quickly loses his self-confidence, until he hears about a couple of purse robbers who are on the loose at the carnival.

Sam and Andy call on modern technology to finally get Goober a steady girl.

Sam brings over one of his Italian friends from the war--but unbenowst to him the friend brings over his elderly father and sister--and this creates mayhem in his family and business.