Helen Crump makes her debut in the third-season episode "Andy Discovers America". Opie and his classmates take a dislike to their new teacher (whom they call "old lady Crump"). Andy gives Opie some advice about his own experience with school (which Opie misconstrues into thinking he doesn't have to do his history schoolwork), and Helen shows up at the courthouse to give Andy a piece of her mind.

When the first edition of The Mayberry Sun doesn't sell as well as Opie had hoped, he decides to turn it into a gossip column, using several juicy tidbits he has overheard around the house. When they realize what has happened, Andy, Barney and Aunt Bee scour the town to try and retrieve all of the copies the boys have distributed.

Although Barney can frequently be seen planning dates with her over the phone, Juanita never actually appears on the show.

A chronic jay-walker, Emma Watson annoys Barney who is constantly trying to ticket her. He keeps a file on her called "The Emma Watson Case."

For a $400 investment, Aunt Bee becomes part-owner of Mayberry's first Chinese restaurant. The restaurant does quite well, but the prediction in a fortune cookie makes Aunt Bee re-consider the wisdom of her investment.

Walker's Drugstore is a two-story ornate structure on Main Street in Mayberry just across the street from the Mayberry Courthouse block including Floyd's Barbershop and Foley's Grocery and the Mayberry Town Hall.

Ernest T. has his mind set on marrying Briscoe Darling's daughter Charlene, despite the fact that she is already engaged to Dud Wash. Ernest T. devises a nefarious plan to steal the bride, but Andy is one step ahead of him--and the "bride" Ernest kidnaps is actually Barney in disguise.

In "Barney's Physical", we learn that Barney and Thelma Lou met at Wilton Blair's funeral in 1960.

Ernest T. Bass is a hillbilly who appears in town from time to time with his trademark greeting, "Howdy do to you and you. It's me, it's me, it's Ernest T!" He loves breaking windows with rocks and prides himself on being "the best rock thrower in the county."

When they discover his genealogy, the Women's Historical Society wants to award Otis an honorary plaque. Barney and the mayor worry he will show up drunk to the ceremony, but Otis arrives sober, clean-shaven and wearing a suit. He humbly gives the award to the town stating that he cannot take credit for "just being born."