Needing some help in finishing to write his autobiography, Beaver is able to convince his classmate Betty, who has a crush on him to write it for him. However, when she discovers Beaver and Gilbert were poking fun about her behind her back, she decides to add a lot of lies to his paper.

After finding out that his steady girlfriend started going out with a new boy at their high school that has a mustache, Wally takes Eddie and Lumpy's advice to grow a mustache, thinking it will make him more mature. However after doing so, Wally soon discovers that his newly grown mustache doesn't have the affect on Julie's opinion of him as he originally thought it would.