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Down in San Diego was previewed as Young Americans, which is why prints still exist bearing both titles. The film is essentially a gussied-up MGM version of an "East Side Kids" pictures, even unto casting Leo Gorcey in a major role. A gang of teenagers with too much time on their hands decide to pool their energies when the marine-cadet brother of pretty Betty Haines (Bonita Granville) gets into trouble. It all leads to the roundup and capture of a Nazi spy ring, bent on sabotaging San Diego harbor. Much of the film appears to be an audition for several of MGM's fresh young contractees, including singer-dancers Ray McDonald and Dan Dailey Jr. Down in San Diego was also a milestone of sorts, representing the 100th film made by supporting player Henry O'Neill within an eight-year period.