Opie and Arnold find an abandoned infant on the courthouse steps.

After Dolly, a retired milk-wagon horse refuses to eat while her owner is out of town; Opie becomes really worried that something is wrong with her. Unsure of what to do, Opie turns to Goober, Howard and Andy for help in getting the horse to eat. It is only after Mr. Simpson returns home from his vacation that he and Opie discover that Dolly refuses to eat because she misses going to work every day.

Opie has to choose between piano lessons and football lessons.

Opie has a hard time finishing one of his homework assignments.

Opie has a really big crush on classmate Mary Alice Carter, but she has her eyes on hunk Fred Simpson. When Opie asks her to the dance, she says yes, not thinking Fred will ask her. When Fred asks her, she immediately says yes and has to think of a way to tell Opie she can't go with him. At the dance, Mary Alice realizes that she really wants to be with Opie and they end up together.

Opie disobeys Andy and tape-records a bank robber's confession.

Opie joins a rock-and-roll group and starts getting failing grades in school.

Opie gets a job working at the drugstore and learns that everyone makes mistakes.

The Church Members must decide what to purchase with the $500 that's willed to the church. The choice is between Choir robes and repairing the church's foundation.