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.
YMMV: The Thin Man
Big Lipped Alligator Moment: Nightmare Fetishist Gilbert Wynant asks Nick Charles about various criminal and insane behaviors, like cannibalism. Nick points Gil to the story of Alferd Packer — and Hammett inserts an in-story reference article on Packer that runs roughly six pages (in a mass-market paperback edition). It's never brought up again.
I Am Not Shazam: Nick Charles is not the Thin Man. However, some of the later sequels' titles gave in and used it like he was.