American Psycho/Trivia

The book:

 * Genius Bonus: 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 it's "peanut butter soup". You don't have to be a genius to be weirded out by that one (peanut soup, sometimes using peanut butter to speed up cooking, does exist though-- and is quite tasty).

The film:

 * Hey, It's That Guy!: Jackie Burkhart is a serial killer and Captain Kirk is an university professor.
 * Subverted with the director. He's not that Morgan Freeman.
 * Hey, it's the Green Goblin!
 * Angel Face meets an even nastier end here.