http://libremdb.catsarch.i2p/title/tt0031381?ref_=nm_ov_bio_lk
Selznick was close to running out of money, so he asked his angel, millionaire Jock Whitney, to loan him enough to finish the film. The film was finally completed and edited, then was test-marketed at a theatre not far from LA. The viewers were excited about having seen it and said so on their preview cards, which allowed Selznick to rest easy, knowing he had a hit on his hands.