Star Spangled Rhythm (1942)

"The Paramount Musical Comedy Of All Time!"

Pop, a security guard at Paramount has told his son that he's the head of the studio. When his son arrives in Hollywood on shore leave with his buddies, Pop enlists the aid of the studio's dizzy switchboard operator in pulling off the charade. Things get more complicated when Pop agrees to put together a show for the Navy starring Paramount's top contract players.