* IncestuousCasting: Averted at the very last minute. See below.
* SleeperHit: WarnerBros thought that the film would bomb, feeling that nobody would want to [[DracoInLeatherPants cheer for the outlaws]] in a gangster flick, and dumped it in [[DumpMonths August]] and offered Warren Beatty 40% of the gross as a result. Upon release, the mixed critical reception seemed to bear out their fears. But when young people started raving about it to everybody in earshot, it turned into one of the biggest films of 1967, and remains a classic.
* WhatCouldHaveBeen:
** The writers of this film originally hoped to they could get either of the great FrenchNewWave directors to helm this film, FrancoisTruffaut or Creator/JeanLucGodard. Unfortunately after helping develop the script, Truffaut ultimately decided to direct ''{{Fahrenheit 451}}'' instead and Godard turned out to be an unreasonable jerk when the producers were courting him. So ArthurPenn, whom Truffaut had recommended, did it instead.
** Creator/ShirleyMacLaine was considered for Bonnie, but Warren Beatty decided to play Clyde and preferred not to have to [[IncestuousCasting kiss his sister on the mouth on-camera]].
** Creator/JaneFonda turned down the role of Bonnie.
** Warren Beatty once considered BobDylan for the role of Clyde.
** Bonnie and Clyde were originally supposed to have a bisexual relationship of their driver, but that was changed when ArthurPenn felt that would have diffused the audience sympathy, leading them to be dismissed as "perverts" because they are criminals and ultimately harmed the story. There were also rumors that Creator/WarrenBeatty was not able to portray a bisexual and ruin his image and there was the fact that the UsefulNotes/HaysCode would never have permitted it in the film in the first place.
----