Revealing mistake: When the farmer is going to shoot the sign the bank put up, you can very well see the mark where the hole is going to appear.
Continuity mistake: When Bonnie and Clyde are in the hotel room trying to have sex, Clyde stands up and Bonnie lies on her side and there is a gun right by her face. Throughout the rest of the scene there is no gun on the bed at all.
Continuity mistake: During the final shoot-out scene Bonnie's bullet wounds go from being bloody to being black holes and back to being bloody again in about three shots.
Continuity mistake: In the first shoot-out that involves the entire Barrow gang, Estelle Parsons becomes hysterical with a spatula and dish towel both in her left hand. The filming cuts away for one second and then she has the dish towel in her right hand and the spatula still in her left hand where it remains for the rest of the scene. This scene is a little more than one third of the way into the movie (VHS).
Continuity mistake: When Bonnie and Clyde meet C.W. for the first time at the gas station, there are cuts back and forth between a medium shot from the front left side of the car and a closer shot from C.W.'s perspective, standing at the front right side of the car. In one shot Bonnie's right hand is positioned under her jaw, and her right elbow in resting of the top of the passenger side door. In the other shot her right arm is stretched out straight and resting on the door. There are at least two cuts and at least two appearances of each shot.
Continuity mistake: When Bonnie and Clyde are in the hotel room after they unsuccessfully try to have sex, Bonnie's hair is all messed up. But when Clyde says, "At least I ain't a liar." he turns around and looks at Bonnie and her hair is perfect.