At the time of the film's production, Universal built a special stage to film miniature scenes. A gantry was constructed above the stage so a model biplane could be 'flown' over a huge miniature set. The stage is still on the Universal lot and is numbered 27. The stage also contains a large water tank. At one time it was known as the John Fulton Stage since when the stage was built, Fulton was in charge of all visual effects for Universal.
First movie to feature an airplane-flying-through-a-hangar stunt, performed by stunt pilot Paul Mantz.