- The first chapter involves a drug which causes hallucinations and violence while sleepwalking. It's called Cesare.
- The second chapter opens with a line-for-line homage to the diner-robbery scene in Pulp Fiction.
- During the first chapter of Murder Party, one of the criminals asks "This wasn't a Hunter exam?"
- Chapter 12, "DK: Domestic Killing", has a cover page featuring Kuroko, Hinako, and three other women all wearing Guy Fawkes Masks.
- Tons toward the Cthulhu Mythos:
- The story takes place in R'Lyeh City.
- There is an amusement park called Tekeli-li Land featuring "Shogo-tans" (i.e. Shoggoths) as mascots; a Spinning Cthulhus ride (instead of spinning cups) and a Deep Ones ride instead of a Merry-Go-Round.
- Before she was abducted by the Rainy Day Killer, Sora was buying things at Dunwich Market.
- Rinko used to attend Cthulhu Elementary School.
Shout Out / Murciélago