There are some neat Easter eggs for the noir genre. "Frank Chisel" is a pun of "Mike Hammer", a well-known detective. He also lives at "741 Spill Lane"; obviously a reference to Mickey Spillane, one of the greats in the genre. Liz also prepares deviled eggs with a brain topper; it's a pun on "hard-boiled" detectives.
In keeping with the parody of noir thrillers, whenever Liv is onscreen the image is black-and-white or extremely desaturated color. Similarly, the score is reminiscent of those films' music, with pronounced use of muted trumpet, piano and stand-up bass.
Aly Michalka is actually a good singer. She intentionally sang badly because Peyton is supposed to be a bad singer.
Don E's girlfriend's full name is Darcy Bennet which also happens to be the last two names of the main characters in Pride and Prejudice.
The case file read by Liv indicates that Frank Chisel resides on Spill Lane. American author Frank Morrison Spillane - aka 'Mickey' Spillane - regularly featured the character, detective Mike Hammer, in novels and short stories published starting in 1947 with "I, the Jury".