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* {{Anvilicious}}: Both the book and film have sections toward their endings that make it ''very'' clear how much Creator/TrumanCapote hated capital punishment.
* AwardSnub: Creator/TrumanCapote was highly annoyed that the 1967 film version wasn't nominated for the Best Picture UsefulNotes/AcademyAward, and yet [[BoxOfficeBomb the musical dud]] ''Film/DoctorDolittle'' was.
-->"Anything allowing a Dolittle to happen is so rooked up it doesn't mean anything."
** Scott Wilson and Robert Blake were also not nominated despite the widespread acclaim both received for their performances.
* HarsherInHindsight: Creator/RobertBlake, who played Perry Smith in the 1967 film, became a real life murder suspect in 2001.
* OutlawCouple: If one reads into the HomoeroticSubtext between Dick and Perry, They fit this trope.
* HoYay: The book has several instances of Hickock calling Smith "honey" and “baby”, and Smith remarks that he has [[DoesThisRemindYouOfAnything "many thoughts of Dick"]] during their incarceration at Las Vegas. Given how Truman Capote was a well-known homosexual author and there were allegations that his relationship with the two killers exceeded "simply platonic", one has to wonder how much of this was unintentional.
* OlderThanTheyThink:
** Although this piece of work is often credited as the first NonFiction novel, in fact ''In Cold Blood'' appeared nine years later than ''Literature/OperationMassacre'', from the Argentinian journalist and writer Literature/RodolfoWalsh. 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.
* RetroactiveRecognition:
** Creator/RyanReynolds appeared in the 1996 TV miniseries as a minor character named Bobby Rupp.
** Scott Wilson (Hickock in the 1967 film) has gained latter-day recognition as Hershel on ''Series/TheWalkingDead''.
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