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.
Suggested correction: Was it under the main bustle?
Scarlett is laced up then Mammy helps her on with her dress. Looks like Scarlett is just wearing her corset (stays) with pantalets. Selznick probably adhered to the customary undergarments in the nap scene but chose no film time for the hurried scene where Gerald counts to 10 to make Scarlett hurry down to his carriage.
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.
Suggested correction: Big Sam quickly dispatches Scarlett's attacker (potential rapist in the book) and Scarlett grabs the reins to just get out of there as fast as she can. Big Sam continues to handle the attacker. Then, Big Sam runs after the carriage, calling out to Scarlett.
Continuity mistake: When Rhett visits Scarlett after Frank Kennedy's death she keeps weeping into her handkerchief. But all of a sudden there is no handkerchief and she is wiping her nose with her hands. (00:57:55)
Suggested correction: Scarlett puts her handkerchief down to gargle with cologne. Then she goes downstairs with the hanky near her mouth to hide her boozy smell. She has opportunity to put it down again when she is seated telling Rhett she is afraid she'll go to hell. She is so upset she wipes her nose with her wrist as she does several times in the film, as Rhett observes at the end when she has no "handkerchief."
Continuity mistake: When Scarlett is flirting with the Tarleton twins dogs and horses in the background appear and disappear in a very discontinuous way. (00:07:35)
Suggested correction: Animals are not stationary, so they are bound to move. Also, if you watch it again, you will see some of the dogs running across the yard in front of Scarlett and the twins.
Continuity mistake: When Aunt Pittipat leaves Atlanta Scarlett and Dr. Meade are standing in the walkway to the house and talking. The moment the aunt drives off Scarlett is standing all by herself (and loudly cursing Melanie and her baby). (01:07:30)
Suggested correction: Just before Aunt Pittipat rides off, we see Dr. Meade move away from Scarlett. By the time it cuts back to Scarlett, he has had more than enough time to get off-screen.