 Lisa Vultaggio, who played the optician used to bait the killer, had previously worked with Morgan and Wong in "The X-Files", appearing in the first season episode "Beyond the Sea".Producer and writer Chip Johannessen felt that the scene in this episode in which a human hair is discovered with a message inscribed upon it was a "perfect" moment, in that it "told you everything about this guy [the killer] ... but you had no idea what he was or what he was going to do next ... you know what kind of crazy motherfucker would do that, but where he is or what he's going to do next, who knows".The episode's opening nightmare sequence, in which Jordan Black (Brittany Tiplady) is terrified by a clown crawling along the ceiling, was inspired by the childhood nightmares of Morgan and Wong, and left Tiplady suffering from bad dreams herself for several nights after filming.