Continuity mistake: In the scene where Scarlett is talking to Ashley about owing the carpet bagger 300 dollars right before Ashley kisses her you can see a definite change. Ashley has different dirt on his face and Scarlett's dress looks lighter. Her hair is also loose in different places.
Continuity mistake: When Dr. Meade announces General Lee's victory (and later Rhett Butler as a special guest) at the "Monster Bazaar", he speaks to a backdrop showing the audience with a soldier with a drum standing left to him. Behind him, a couple in black is dancing. When he moves, Rhett and Scarlett are revealed, going to the rear of the dance floor. Clearly they haven't met at that point, as they are introduced by Melanie moments later.
Continuity mistake: The shadow scene in which Scarlett and Melanie care for the wounded in the Atlanta hospital was filmed with two doubles. Since Leigh and de Havilland were standing at the wrong angle to cast the shadows, two stand-ins were positioned in front of the high-intensity light. The shadows of the doubles were reflected on the wall behind the stars, and the result was a stunning visual effect. Yet upon a closer look, the gestures of the stand-ins are not totally synchronised with the movements of the stars. (00:56:30)
Continuity mistake: In the scene showing guests arriving at the Wilkes' barbecue, you see buggies and carriages driving through the front gates and up the drive toward the Wilkes' home. The carriages clearly create shadows on the ground, but not on the stone pillars of the gates. This is because when the movie was filmed, there were no actual gates. The gates were later "painted" into the frame. Proving someone forgot to "paint" shadows onto the pillars. (00:17:15)
Continuity mistake: When Scarlett is attacked in the woods on a bridge while on her way to the lumber mill the buggy very nearly goes off of the bridge backwards. Then Scarlett faints, but when the camera returns to the full shot of the buggy, suddenly it is squarely in the middle of the bridge and in no danger at all of falling over the edge.
Continuity mistake: While our protagonists flee from the burning Atlanta the carriage stops. A bearded soldier walks by carrying another man. A few moments later the camera focuses on a young man who collapses and is being picked up by exactly the same guy who was carrying him already. The mistake wouldn't be as pronounced if it weren't been one of the few instances where action by extras is highlighted. (01:23:25)
Continuity mistake: When Scarlett undresses for her nap after the 12 Oaks barbecue, she unties a small bustle from around her waist. She didn't have this bustle on when Mammy helped her dress for the barbecue earlier that morning.
Continuity mistake: In the scene when Rhett is saying goodbye to Scarlett before he leaves her on the road to Tara alone, he throws his hat behind him onto the road and takes Scarlett into his arms. However, a few moments later, he picks the hat up from the fence at his side along with his coat. (01:26:55)
Continuity mistake: When Rhett stops the carriage on the bridge at the turn for Tara, he pulls the brake to keep the carriage from moving. When Scarlett drives off in the carriage, she does not release the brake. (01:27:50)
Continuity mistake: When Gerald O'Hara comes back from his afternoon ride he meets Scarlett in the fields. In the middle of the conversation, while they are walking along, the formerly bright sky all of a sudden turns to a dusky red, and Scarlett has a new hairdo that covers her ears. (00:11:20)
Continuity mistake: In the scene where Bonnie and Rhett have just arrived back from London, Bonnie runs up the stairs to greet her Mom, arms flying all over the place. In the next shot, Bonnie is holding the kitten that Rhett bought her.
Continuity mistake: When Scarlett is attacked in the woods, Big Sam drives her carriage out of danger. When the scene cuts to a far shot of the carriage driving through the woods, Big Sam is no longer with her. She is driving it by herself.