These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
In regards to adultery, the film paints a portrait that adultery is bad if you're a bad person. Crystal Allen and Miriam Aarons both have affairs with married men, but Crystal is considered the villain because of how manipulative she is.
The line about Crystal's black maid from the '39 film: "[Krystal] thinks that just because Lou's dark he won't see her!"