I ran into a quick promotional preview recently for upcoming MGM films (1937-1938 timeframe). Check out the early cast for Three Loves Has Nancy:
One of those casting decisions that makes you go "hmmm." I don't think Margaret could have pulled off "folksy," IMHO she was too polished for that. Melvyn Douglas - too serious too? Of course, the real cast turned out to be Bob, Janet Gaynor, and Franchot Tone.