According to Gillian Anderson, her daughter Piper Anderson-Klotz drew the drawing of the horned monster that Mulder is showing everybody during the whole episode.
After Mulder questions Scully why she is putting herself in danger by going after suspects without backup, Scully says to Mulder "You forget I am immortal". This is in reference to the fan theory that Scully is immortal. This idea first came into view when in another Darin Morgan episode Clyde Bruckman's Final Repose (1995) Scully finally asks Clyde Bruckman, who can predict how people die, how does she die and he answers that she doesn't. This idea solidified when in the episode Tithonus (1999), Alfred Fellig exchanges his own immortality to save Scully.
According to Darin Morgan the ringtone of Mulder is The X Files theme because he wanted to make a tribute to Hollywood A.D. (2000), the episode that David Duchovny wrote in which they make a movie based on the X Files and with characters based on Mulder and Scully. He thought it would be funny if the score of that movie was the same as The X Files and Mulder had it because it was special to him.
The comedian Kumail Nanjiani, known for shows such as Silicon Valley (2014) and The Meltdown with Jonah and Kumail (2014), who plays the game warden Pasha in this episode, is also a devoted X-Phile who hosts "The X-Files Files," a podcast on which he discusses and analyzes in detail each episode of the original series.
The scene with Mulder lying in a bed wearing red underwear, references the infamous scene of Mulder coming out of a pool in a red speedo in Duane Barry (1994).
D.J. 'Shangela' Pierce: The self-proclaimed "Daenerys Targaryen of drag" plays Annabelle, the witness who is identified as being transgender.