After Scarlett kills the Yankee soldier, Melanie removes her nightgown, intending to use it to clean up the blood. She is supposed to be nude. In the newly remastered version, Melanie is clearly wearing a bra, which didn't exist until early 1900s.
(at around 1h 05 mins) In the scene where Scarlett leaves the military hospital in Atlanta, repulsed at the impending leg amputation, she runs out into the street where panic has ensued. The scene goes to a wide shot of the square. A radio tower is visible in the distance, painted the standard alternating red and white scheme still used today. Radio towers existed in late 1930's, but not in 1864.
When trying to get Dc. Meade, Scarlett runs past a lamp post containing an electric bulb; in fact, all of the lamp-posts visible on the right-hand side of the road she runs down contain visible light-bulbs.
After the lists come out about Gettysburg casualties, the band plays "Dixie". The camera settles on the two fife players, and their finger movements do not match the music they're supposed to be playing.
In the opening shot of Scarlet and the Tarleton Twins on Tara's front porch, the shadow of the boom mike is clearly visible on the pillow of the porch swing behind Scarlet. Watch it rise as the trio stands up.
At the beginning of the film there is a huge oak tree outside Tara's front door. After the war, and the Yankees have burned everything, the tree is gone. When the war is over, the tree returns in all its glory.
When India and Suellen discuss Scarlett's flirtations with their respective suitors, they are standing in front of a large mirror which reflects the central landing (with the window), the full width of the descending stairs and the left-hand railing. Scarlett meets Frank Kennedy coming down the left-hand side and flirts with him midway up from the base to the landing (well within the area reflected by the mirror). However when the sister remarks upon this flirtation, neither Scarlett nor Frank is reflected in the mirror.
When Rhett and Mammy share a drink after Bonnie's birth, Rhett has his cigar in his mouth as he stands by the fireplace (he even has some trouble talking with it between his teeth). A second later he is suddenly holding his cigar in his left hand.
When Scarlett approaches the Twelve Oaks stairs after her conversation with Ashley, Melanie, and Charles, she greets Frank. For a split second, Rhett Butler is in the background. In the next shot, Rhett is no longer there.
After the Tarleton Twins tell Scarlett of Ashley's impending marriage to Melanie on the porch of Tara, during the famous scene where Scarlett runs down the driveway, the Tarleton Twins disappear from the porch in the long shot.
Before Scarlett, Rhett, Prissy and Melanie leave for Tara, Scarlett's hair is messed up. It's neater when she gets into the wagon. When they stop so Rhett can leave, her hair is almost neat. When she arrives at home, it's messy again.
Getting ready for the BBQ at Twelve Oaks, Scarlett begins dressing by pulling on her hoop skirt. She is missing the bustle pillow and she never ties the hoop skirt on. The next scene shows the dress being pulled down over her head, her hair has been fixed slightly different than the previous shot, and all of Scarlett's trappings are securely attached under the dress.
Scarlett leaves the hospital in Atlanta wanting to get away from another gruesome duty, she leaves and closes the door. A wide shot shows the door swing open and remain open in wide shots, subsequent close ups show the door closed.
In the far shot of Tara at dawn, just before Scarlett goes out to the garden, the large tree seen earlier at the right front corner of the house, taller than the house itself, is entirely missing. Later, as Melanie runs from the house to greet the returning Ashley, the tree is back, bare with most of its branches missing. Still later in a far shot of Tara seen from the same angle, as Gerald rides up the driveway to chase away Jonas Wilkerson, the tree is full with branches.
Mammy mistakenly says "John Wilkenson's" instead of "John Wilkes" in her famous line, "I ain't aimin' for you to go to Mr. John Wilkenson's and eat like a field hand and gobble like a hog!" The barbecue was held at the home of John Wilkes, not Jonas Wilkerson, the overseer.
When they're leaving for Tara, Rhett carries Melanie from her bed with both arms while Scarlett holds a lamp on the other side of the room. In the next shot, a hat appears on Rhett's head despite the fact that no one in the room could have put it on him.
After Scarlett visits the makeshift hospital at the church, she closes the door behind her in the close-up. In the long shot that follows, the door swings open again. Back to the close-up as Scarlett moves away from the door, and it is closed again.
As Rhett and Scarlett flee Atlanta, he stops their wagon to comment on the fall of the old South. Interspersed with his comments are scenes of wounded soldiers walking on the road. A bearded man smoking a pipe is shown carrying a fallen comrade. Several scenes later, the same man is shown carrying a rifle. He gives his rifle to another soldier and picks up the soldier he was seen carrying in the previous scene.
After Rhett and Scarlett flee Atlanta, he stops the wagon at the crossroad to Tara. When he does, he sets the brake on the wagon. After he leaves Scarlett, she turns to the horse and starts to lead it down the road to Tara - without releasing the brake.
While lining up for the Virgina Reel, a woman in a blue dress stands next to Scarlett. Seconds later, Scarlett is next to a woman in a light orange dress, and the lady in blue has moved down a few places.
In the scene at Twelve Oaks, when the men are gathered arguing about war, Rhett Butler (in a group long shot) flicks his cigar into an ash tray. Immediately after, in a close up, he again reaches over and flicks his cigar ashes.
After Rhett angers the men about how he doubts the South can win the war, Ashley goes after him. As Ashley is leaving the room, for a brief moment, the shadow of a shorter person can be seen behind him.
While Melanie is talking to a soldier in the hospital he tells her that he hasn't heard from his brother Jeff since the Battle of Bull Run. That battle was called Bull Run by soldiers of the North. It was called The Battle of Manassas by soldiers of the South.
Gerald O'Hara comes running into Tara shouting that the war is over because Lee surrendered. Lee surrendered the Army of Northern Virgina on April 9, 1865, which had no effect on Georgia. In fact, Georgia State Troops didn't surrender until almost a month after Lee. The surrender of Gen. Kirby Smith at Galveston, Texas, on May 26 is considered the end of the Civil War.
The credits read "Brent Tarleton.....George Reeves, Stuart Tarleton.....Fred Crane," but that's backwards. Selznick was informed of the error but decided it would be too costly to correct it, as prints had already been struck. It's easy to remember which is which. George Reeves tells Scarlett that she'll dance with both of them: "First Brent, then me, then Brent, then me." So that means Crane played Brent and Reeves played Stuart.
During the barbecue at the Wilkes' where she wears a green dress we have not previously seen, Scarlett says to the Tarleton twins, "but I wore this old thing because I thought you liked it." While this could be taken as a reference to an earlier scene (which it was in the novel), she could just as well be referring to a time before the movie started. (In the original script she was seen earlier in the green dress, but the dress was changed to white without changing the line in this scene).
Melanie is not pregnant for 21 months - she is pregnant for just over eight months. Some viewers have calculated incorrectly by dating Ashley's Christmas furlough (Beau's conception) to December 1862 instead of 1863. Rhett mentions the Battle of Gettysburg (July 1863) in a scene prior to the furlough.
In the railyard where the soldiers are laid out, two men carry a rolled up stretcher across the top of the frame and then turn left to proceed down the left side. The man in the rear steps on the leg of a soldier and leaves a footprint/depression in a dummy's leg.
As Scarlett talks with Pa before the pull-back showing the sky, Tara plantation and wind blowing through Scarlett's dress, the sun is supposedly setting behind them, yet Pa's cane continually casts shadow all over Scarlett's face as he gesticulates.
While Scarlett and Cathleen Calvert are ascending the stairs at Twelve Oaks, they discuss Rhett Butler. Right after Cathleen states that Butler is not "received," we catch a brief glimpse of Rhett in the background of the long shot. It is obvious that Clark Gable is not in this long shot. The impostor has a thick mustache, thick hair and is much paler than Gable.
As Scarlett and Rhett are fleeing Sherman's troops, their horse becomes frightened and refuses to move amidst the flaming wreckage. Rhett ties a cloth around the horse's face so it can't see the flames. As soon as he starts leading the horse through the debris, the cloth falls away from the horse, which seems to be no longer afraid of the flames.
When Scarlett climbs down the stairs before Rhett, who carries Melanie, she holds a lamp to the wall side. Although the only light then supposedly came from the lamp, their shadows are projected on the wall.
When Ashley comes to Atlanta for Christmas during the war, he and Melanie go upstairs to bed and call over the banister of the staircase landing to Scarlett. They proceed on to their room, and we see the light from their room reflected on the wall at the staircase landing. The light disappears as their bedroom door closes, leaving Scarlett watching in misery. However, when we see Prissy and Scarlett packing to leave Atlanta because Sherman is coming (while Melanie is in labor) it appears that there is no bedroom in a position that could leave a light on the landing wall.
During the opening credits, the matte shot of Atlanta does not match up with the flagpole of the Confederate flag flying over the city. The flagpole sways in the wind and is clearly not attached to the matted part of the flagpole, which remains stationary.