In an AMA that Gillian Anderson did on Reddit in October 2014, she said this is her favorite X-Files episode.
Gillian Anderson wanted her younger kids to see her in The X Files and chose this episode, thinking that they would like it, but it gave them nightmares.
The vampires' glowing green eyes were achieved by putting fluorescent stickers on the actors' eyelids.
This is inspired by an episode of The Dick Van Dyke Show (1961) in which Dick and Laura give conflicting accounts of a fight that they had.