Barney buys a fortune-telling game and mistakenly summons the 200-year-old spirit of a count who offers to grant Opie three wishes.
Otis slips in the sheriff's office and a crooked lawyer convinces him to sue the county so it will be forced to upgrade the jail. Thinking Andy and Barney will be happy, Otis agrees.
Barney becomes a part-time real-estate agent and soon has a couple of buyers and sellers lined up, including Andy.
Left in charge for just a few days, Goober dismantles a car in Andy's office.
Otis rides into town on a cow under the impression that it's a horse.
Andy uses common sense and Barney uses modern technology to solve several burglaries at a filling station.
Andy's knowledge of American history is put to the test by Opie and a new teacher.
Colonel Harvey, a traveling salesman, arrives at Mayberry and captivates Aunt Bee, who buys Harvey's dubious elixir and invites him for dinner. When Andy and Barney find Aunt Bee clearly drunk, they analyze Harvey's elixir.
Andy unexpectedly has his hands full as The Darlings, a family of musicians from the mountains, arrive in Mayberry to meet a bus due the next day.
Malcolm Merriwether, an English tourist, passes by Mayberry on a bicycle. After causing a traffic accident, he agrees to work off the damages as Andy's personal valet.
Barney spends his life savings to buy a used car. Unbeknownst to him, the car is actually a lemon and has several issues and defects.
After Opie is struck with puppy love, Barney tries to show him how to handle women.