Virginia O'Brien's first credited screen appearance.
Frank Morgan supposedly does voice imitations of Al Jolson, Ted Lewis, Wallace Beery, Robert Taylor, Mickey Rooney and Hedy Lamarr. However, Rooney's and Lamarr's voices were dubbed by other actors, and Taylor's voice was so perfect it was probably from the soundtrack of one of his films or the actor himself. Morgan also impersonates Clark Gable, Claudette Colbert and Spencer Tracy in a scene from Boom Town which opened 3 months earlier. Again, the voices were so perfect they undoubtedly came from the soundtrack of that movie.
Some cast members in studio records/casting call lists did not appear or were not identifiyable in the movie . These were (with their character names): M.J. Frankovich (Golf broadcaster) and Charles Lacey (Golf pro).
The radio broadcast of "The Battle of the Planets" which caused such a panic in this movie was clearly based on Orson Welles' broadcast of "The War of the Worlds" on 30 October 1938, which did cause a national panic.