Before watching the movie:
I’ve heard the popularity of Nick and Nora Charles is in their banter. As this is not the version that left that out (that would be the Broadway musical…), I’m looking forward to it. The writing must be up to it, or it wouldn’t have been and still be popular.
This is an early example of heavily sequelized films, all with silly titles that probably belie their lack of purpose. If you thought today’s sequels were pointless, you haven’t heard of The Thin Man Goes Home.
I’m at a loss for what else to look out for. I don’t doubt much that the mystery is also worthwhile, since it’s the original Hammett story. I’m always more entertained by films of this age than I expect to be, and that goes right back to the character banter.