 On the first day of shooting, involving the train robbery scenes,  Katharine Ross (qv) came to the set to watch. There were five  cameras, and only four operators, so the DP put her on the extra  camera. He showed her how to operate it, and how to move it to get  her shot. Director George Roy Hill was furious, but said nothing the  whole day. At the end of the day, he banned her from the set except  when she was working.