A visiting preacher tells the town to relax and enjoy the simple pleasures of life. He inspires everyone to have an old-time band concert. With all the stress of rebuilding the broken-down bandstand and getting ragged uniforms ready, they wear themselves out.
After being treated to Aunt Bee's hospitality and home cooking, Briscoe Darling decides he is going to marry her. He even resorts to kidnapping her. Andy comes up with a clever solution to the whole mess.
After Gomer gets fired from the filling station (losing his room there), he moves in with Andy. When people come by the house at all hours of the night to get their cars looked at, Andy knows he has to do something.
Andy and Barney have to protect a shipment of gold which will be going through Mayberry on the way to Fort Knox. It's critical that they keep it a secret, but Barney spills the beans immediately and within minutes all of Mayberry knows. A carnival-like atmosphere soon takes hold. The plot thickens when Barney discovers there's no gold in the truck.
A mistake by Opie's teacher causes him to get all A's on his report card. He finds out the truth, but everyone is so proud of him (he even receives a new bike) he can't figure out how to break the news without disappointing them all.
Barney's landlady evicts him and he has to move into the back room of the courthouse. When she withdraws all her money and decides to marry someone she just met, Barney suspects she is the victim of a con man.
Gomer makes a citizen's arrest of Barney for committing the same traffic violation that Barney just ticketed him for. This causes Barney to overreact, resigning as deputy and demanding a jail sentence in lieu of paying the fine. When Gomer finds out how far it has gone, he tries to come up with a solution.
After Andy and Helen go exploring in a cave, it collapses behind them. They find another way out, but hear on the radio that Barney has mobilized the town to rescue them. They go back into the cave to save Barney from becoming a laughingstock.
Two fun-loving girls from Mount Pilot interrupt Andy and Barney's late night office work. When Helen and Thelma Lou see them together, they get upset and cancel their dates to the big dance. Barney decides he and Andy will take the fun girls instead.
Gomer joins the Marines to test himself as a man. Andy drives him to the base and stays around for a while to see how it works out. When he finds out the Sergeant plans to get Gomer sent home, he tries to find a way to get the Sergeant on Gomer's side.