 This movie was filmed roughly the same time as  _Hello, Dolly! (1969)_ (qv), on the soundstage next door. The  director believed that the studio would allow him to film the New  York scenes on "Dollys" sets, since the two films daily shooting  schedules were totally different. After production started, though,  the studio informed the director that they wanted to keep the sets  for "Dolly" a secret and so refused him permission. To work around  this, the director had Redford, Newman, and Ross simply pose on the  sets, and took photos of them. He then inserted images of the three  stars into a series of 300 actual period photos, and spliced the two  different sets (real and posed) together to form the New York  montage.