 FAIR: 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).