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.