At the time that this episode aired, Perrey Reeves, who played Kristen Kilar, was David Duchovny's girlfriend.
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?
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.
When Mulder leaves John in the cell, hoping the fear of the "rising sun" will make him tell the truth about the murders, the sun is setting, not rising.