Some movie posters for this film featured a long text preamble that read: "The Second Greatest Flyer in the World. The war was over - and the world's greatest flyers had never met in combat. But Waldo was going to change all that - even if it killed him".
In keeping with the film's aviation theme, the pictured opened with the old black-and-white Universal Pictures logo presentation, which features an old early 20th Century plane flying around the orbit of the planet earth.
When Axel Olson (Bo Svenson) crashes in a water-pond after Waldo (Robert Redford) has caused his wheels to fall off, his Curtiss JN4 "Jenny" has transformed to a disguised De Havilland 82 "Tiger Moth".
(at around 1 min) When Axel is flying over a town with Mary Beth out on the wing of the plane, there are many modern cars visible on the towns' streets.