In the final scene, the Unholy Spirit said in Transylvanian, "I will live forever."
The cross necklace is much longer on Mulder than on Scully. This is either a continuity error, or Mulder actually got a longer chain. But why would he?
Mulder wears Scully's gold cross necklace throughout this episode after Mrs Scully gave it back to him in "Ascension."
Scully's picture on the FBI ID Mulder puts together with the X-file on her abduction is different from the ID shown in the opening credits.
Factual Errors: Mulder claims that John 52:54 states that "He who eats of my flesh and drinks of my blood shall have eternal life, and I will raise him up on the last day." However, this should be John 6:54 as John's gospel has only 21 chapters.
Revealing Mistakes: Since the sun is shown moving towards John, then it is setting, not rising.
Mulder: No mirrors
Kirsten: I don't like the way I look
Mulder: It makes this hard (trying to shave)
Kristen: I'll do it
Commander Carver: Eternal life. Smashed mirrors. Blood drinking. Should I be issuing my men stakes and cloves of garlic?
Mulder: Only if they're hungry.
Kirsten: He tasted my blood and I tasted his. Somehow the feelings... changed. From then on we were into 'blood sports'.
Dr. Browning: An old coroner's trick.
Mulder: I can make a quarter appear from behind your ear.
Mulder: If he wants to talk, cover the windows and call me.
Det. Munson: What if he turns into a bat and flies out through the bars?
Kristen: Are you about to ask what a normal person like me is doing in a place like this?
Mulder: How do you define normal?
Mulder: The guards found no flammable materials? I had believed that this man's illness was psychological.
Dr. Browning: There is a condition known as Gunther's Disease - congenital erythropoietic porphyria creating cutaneous photosensitivity.
Mulder: I'm familiar with porphyria. It's an affliction which causes lesions and blisters when skin is exposed to sunlight, not fourth degree burns. Sufferers may have a hema deficiency which can be supplemented by a small ingestion of blood, not the kind of bloodthirst this man had. It's probably ignorance of porphyria as a disease that led to the creation of vampire myths in Asia in the Middle Ages. I had dismissed the possibility of the actual existence of such a creature as myth.
Dr. Browning: You are really upsetting me. On several levels.
Detective Munson: Why don't you go back to your hotel and get some sleep.
Mulder: I didn't check into a hotel room. I don't sleep anymore.
Mulder: It's a stiff price, though. Look at yourself - drinking blood, living in darkness, unable to see your reflection in a mirror. Or is that just a myth?
John: I can't be seen in a mirror. Look… anything worth anything has a price and when I'm standing next to your deathbed looking as young as I look right now and I see that fear in your eyes at the moment of death … then, then tell me the price is too stiff.
Mulder: It's more likely I'll be looking in your eyes at the moment before they lead you into the gas chamber. That's a moment you won't have to face if you tell me where the others are.
John: Why would I? They're the only ones that can kill me.
Mulder: Well, if you are what you say you are, I know what can kill you.
John: Look, what nobody realizes is that there is no afterlife. I know this. Listen, listen, I know this because when we prolong our lives by taking theirs all I see is such …horror in their eyes and that's because at that moment they're face-to-face with death and then suddenly they realize there's nothing else. There's no heaven. There's no soul. There's just rot and there's just decay. And I will never, ever, ever, ever have to face that.
John: Don't you want to live forever?
Mulder: Well, not if drawstring pants come back into style.
John: You know what we are.
Mulder: What are you?
John: He is the Father, I am the Son, and she is the Unholy Spirit.
Mulder: And the three of you killed Garret Lore.
Mulder: Your fingerprints were found at the crime scene.
John: No. When a snake eats a fly, it's not murder. It just is.
Mulder: Frogs eat flies. Are you dead?
John: I never will be.
Mulder: Do you believe that?
Detective Nettles: Look, Agent Mulder, look I'm really sorry I was such a hard ass back there. In this town, it's really tough to trust anyone. Truth is, I'd be happy to have you work on our investigation. Now this is Detective Gwen....
Mulder: I'm working alone.
Mulder: "He who eats of my flesh and drinks of my blood shall have eternal life and I will raise him up on the last day." They have the same feeble grasp of the Bible as all those big-haired preachers do.
Dr. Browning is played by the same man that played Dr. Berube in "The Erlenmeyer Flask" - Ken Kramer.
A scene in which a firefighter comes to warn Kristen about the fire was cut from the final version of the episode.
The scenes in Kristen's villa were filmed at the house of professional ice hockey player Pavel Bure.
According to David Duchovny, in "Secrets of the X-Files", Gillian Anderson missed the past 3 episodes in this season, although it was cleverly filmed to appear that she only missed this one.
Although she is credited, Gillian Anderson does not appear in this episode.
'Club Tepes' is named after Vlad 'The Impaler' Tepes, the real-life inspiration behind Bram Stoker's Dracula.
David Duchovny and Perrey Reeves had been dating for a while at the time this episode was filmed.
In the vampire bar, the first shot is of a drawing on the wall. The drawing is of Vlad "The Impaler" Tepes. He is a real historical figure notorious for his cruelty, who, for example, impaled his enemies on large wooden spikes by letting them sink down slowly from tip to base as he watched. It is he who inspired Bram Stoker to write about the most famous vampire in western history.
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