This is a list of allusions to pop culture found throughout ǝnígmǝ.
- The design of the skull and symbol of ǝnígmǝ is based off that of late American murderer and body snatcher Ed Gein.
- Sumio's "Mayday" catchphrase and some of his speech from page 10 are derived from the lyrics of Japanese hard rock band B'z's song Mayday!.
- Sumio's Dream Diary is also said to have been based off of Reisuke Hōjō's "Hyper Vision Diary" in Mirai Nikki.
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