Three on a Limb.

Scoutmaster Elmer Brown loses his heart to the pretty carhop who works in a drive-in diner. Complicating his romantic longings is her policeman fiancé. When he tries to eliminate Elmer by giving him traffic tickets for every conceivable violation, the girl takes pity on the martyred Elmer and they drive off together. She informs him that she is also fending off another suitor, Oscar; and to make matters worse, her father is backing the cop while her mother promotes Oscar. Eventually all three men wind up competing for her hand at a chaotic wedding ceremony that ends with Elmer winning his beloved.