Warner Bros. had so little faith in the film that they offered first-time producer Warren Beatty 40% of the gross instead of a minimal fee. The movie went on to gross over $70 million.
When Warren Beatty was on-board as producer only, his sister Shirley MacLaine was a strong possibility to play Bonnie. But when Beatty decided to play Clyde himself, for obvious reasons he decided not to use MacLaine.
The Gene Wilder-Evans Evans sequence is based on the kidnappings of undertaker H.D. Darby and his acquaintance, Sophia Stone, near Ruston, Louisiana, on the late afternoon of April 27, 1933, by the Barrow gang, who had stolen their car. They were both released unharmed several hours later. According to Darby, one of the Barrow gang members asked what he did for a living and when he replied that he was an undertaker, Bonnie Parker allegedly said to him in a sarcastic tone that "You may have to work on me someday." The following year, H.D. Darby was indeed one of the coroners who worked on Bonnie and Clyde after they had been killed by the police.
Gene Hackman was on the set one day when he noticed a guy standing behind him and staring. The man said, "Hell, Buck would've never wore a hat like that." Hackman turned around and looked at him and said, "Maybe not." He looked like an old Texas farmer. The man introduced himself and said, "Nice to meet you. I'm one of the Barrows."