The agents for singer B.J. Thomas regretted letting him do it, and thought it would ruin his career. (Little did they know it would do just the opposite!)
Paul Newman did his own bicycle stunts, after his stunt man was unable to stay on the bike, except for the scene where Butch crashes backwards into the fence, which was performed by cinematographer Conrad L. Hall.
Katharine Ross enjoyed shooting the silent, bicycle riding sequence best, because it was handled by the film crew’s second unit rather than the director. She said, “Any day away from George Roy Hill was a good one.” (This was after she had been scolded and banned from the set for operating a camera.) – IMDB