Beaver's teacher, Miss Canfield, sends a note home with Beaver and the other kids convince him that it's news that he's getting kicked out of school. Beaver and Wally take steps to hide the note from Ward and June.

While playing baseball in the street with Wally, Chester and Tooey, Eddie hits a baseball through the Cleaver's window resulting in Ward forbidding the boys to play baseball so close to the house. However, later, Beaver talks Wally into pitching one, but this results in a broken car window.

For $25, Wally buys a car and signs a contract with the owner knowing full well what he's getting, a car that doesn't start. Wally quickly finds himself with more trouble then he bargained for when the lemon becomes a fixture in front of the Cleaver home.