When Scarlett is heard gagging after hungrily eating the radish at the ruins of the Wilke's home, it is actually Olivia De Havilland who is making the sound. Vivienne Leigh thought it was unladylike to make such a grotesque sound and refused to pretend to vomit. See more...
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Continuity: At the beginning of part 2 Scarlett walks by her sisters who are working in the field, carrying two water buckets. They start arguing, and Scarlett slaps Suellen, without any indication that she had put the buckets down. In the next shot we see her bending forward to pick up the buckets again.
Continuity: 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.