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!!The book:
* GeniusBonus:
** Patrick gives detailed descriptions of each character's clothes, including brand names and prices. Readers who are extremely knowledgeable about 80's fashion will notice that the outfits are clownishly mismatched.
** There's a similar gag involving the food at the various restaurants, which go from outrageous but plausible (red snapper pizza) to outright inedible (mud soup and charcoal arugula).
*** In the film there's also "peanut butter soup". You don't have to be a genius to be weirded out by that one ([[http://www.congocookbook.com/soup_and_stew_recipes/peanut_soup.html peanut soup]], sometimes using peanut butter to speed up cooking, does exist though-- and is quite tasty).
* TechnologyMarchesOn: Patrick's state-of-the-art home entertainment toys seem a bit quaint when read now.
* WriteWhoYouKnow: Ellis has described Bateman as being based on his father.

!!The film:
* ActorAllusion / ActorSharedBackground: Technically an Actor/Writer allusion.
-->'''Elizabeth''': I'm not a lesbian! Why would you think that?
-->'''Patrick''': Well, you ''did'' go to Sarah Lawrence.\\
(GuinevereTurner (who plays Elizabeth) '''is''' a lesbian, and really '''did''' go to Sarah Lawrence.)
* DyeingForYourArt: Christian Bale worked out constantly to achieve the buff, narcissistic look a person like Bateman would have.
* [[FakeAmerican Fake American Psycho]]: Creator/ChristianBale, a Wel-''[[InsistentTerminology English]]'' actor, played Patrick Bateman in the film.
* HeyItsThatGuy:
** Hey, it's [[{{Film/Spider-ManTrilogy}} the Green Goblin]]!
** And [[Film/FightClub Angel Face]] meets an even nastier end here.
* VisibleBoomMic: One casts a reflection off of a CD case in Bateman's office during his 2nd meeting with Detective Kimball.
* WhatCouldHaveBeen:
** Creator/LeonardoDiCaprio was the original actor for Bateman before he had to drop out due to schedule conflicts. Imagine what THAT would've been like.
** Creator/EdwardNorton and Creator/BradPitt were also initially offered the role.

!!The musical:
* PlayingAgainstType: MattSmith as Patrick Bateman.
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