Corrected entry: Robert Redford was originally cast as Butch and Paul Newman as Sundance. Shortly before principal photography began, a crew member suggested they switch roles.
Correction: The incorrect information comes from page 148 of the popular business book, "First Break All the Rules" by Marcus Buckingham and Kurt Coffman.
Corrected entry: The real name of Butch Cassidy's gang was The Wild Bunch. The name in the film was changed to The Hole in the Wall Gang, to avoid any confusion with the film "The Wild Bunch" which was released only months earlier.
Correction: Not true. "Hole in the Wall" was name of the town where Butch and Sundance made their base of operations. Contemporaneous news sources referred to them as both "the Wild Bunch" and also the "Hole in the Wall gang", in fact, there are some that even bill them as "the Wild Bunch Hole in the Wall Gang".
Corrected entry: At one point, Butch Cassidy loads two six shooters, and fires more than twelve shots.
Correction: Butch Cassidy only fires repeatedly in one scene, the first time he kills anyone, and in that scene he does not fire more than 12 shots.
Corrected entry: Butch Cassidy's real name was Robert Leroy Parker and The Sundance Kid's real name was Harry Longabaugh (both are mentioned in the film).
Correction: Then they don't need to be mentioned here, do they.
Correction: This is directly refuted by screenwriter William Goldman's book "Adventures in Screen Trade" which states that Newman was always Butch, the question was whether Sundance would be played by Redford or Steve McQueen.