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.
"Anything allowing a Dolittle to happen is so rooked up it doesn't mean anything."
Harsher in Hindsight: Robert Blake, who played Perry Smith in the 1967 film, became a real life murder suspect in 2001.
Ur Example: Although this piece of work is often credited as the first Non-Fiction novel, in fact In Cold Blood appeared nine years later than Operation Massacre, from the Argentinian journalist and writer Rodolfo Walsh. The late was published in 1957, and was well-known at the moment.
Also "Un millón de muertos" ("One Million Dead"), from the spanish writer José María Gironella Pous, is from 1964, two years prior to Capote's work.