In episode 9, titled "The Eternal Enemy," Amesh mentions shared delusion, known as "Folie à deux," saying that it was the title of an X-Files episode. William B. Davis, who plays the character The Mirror Man in The Midnight Club, was a series regular as The Cigarette Smoking Man (or "CSM" for short) on The X-Files.
In Spencer's story "The Eternal Enemy," Rel reads The Dead Zone by Stephen King.