Remember reading about the production of the movie when really young- for some reason had a phase of being smitten with bios, don't ask me why, as in when a kid. It must have been the Clark Gable bio which featured this movie- never been able to get into the movie, having gotten interested in casting and filming. Like introducing Vivien Leigh while filming the Atlanta scene. It was a hugely coveted part, Vivien Leigh not as well known. It hadn't been cast yet, whoever it was brought her to the set then. Guess the dramatic introduction did it, she was thought perfect ( This is from a bio, from gosh, probably the 60's so who knows how accurate it was? )