Principal setting: Raleigh, North Carolina.
This is the first episode that makes reference to Mulder's pornography obsession. Future writers and episodes will use this again and again, mainly for humor.
This is the first episode in which Mulder is shot (in the femur).
The tattoos on Boggs' hands reading "KISS" and "KILL" come from a song by the band X where there is a lyric which says, "It's kiss or kill".
Chris Carter had to back up the script twice when the network didn't want Scully and Boggs to have a stand-off.
This is one of Chris Carter's, Darin Morgan's and Gillian Anderson's favorite episodes, and the first episode to focus on Scully.
Max Fenig's (from "Fallen Angel") NICAP cap is hanging on the coat rack in Mulder's office at the beginning of this episode.
The article about the gas chamber being readied is written by "G. Morgan." Glen Morgan co-wrote this episode with James Wong.
After Mulder is shot, Scully shouts "Officer down", but the guy behind her (and offscreen) who relays the messages says "Agent down".
When Scully first rushes into the warehouse, she and the agents with her take cover behind a couple of pillars. In the next shot, they are all clustered together, and the pillars aren't in sight.
The episode title is the name of Scully's parent's favorite song. It was played when William returned home after the Cuban Missile Crisis and when he married Margaret, and it is also the chosen music when his ashes are scattered at sea.
Continuity: Scully shoots Lucas Henry in the left shoulder. However, a few moments later he is running and holding his right shoulder.
Boggs: There was that one time when I was fourteen and my parents had gone to bed and I snuck downstairs all alone. Got one of my mom's cigarettes and went out onto the porch in the dark. I was so scared. My heart was beating, I mean, they would have killed me if they knew. But I was so excited. Not 'cause of the cigarette, I mean, it was gross, but because I wasn't supposed to.
Mulder: Why did you lie in your police report?
Scully: I thought it would be a better explanation under the circumstances.
Mulder: What you're really saying is that you didn't want to go on record admitting that you believed in Boggs! The bureau would expect something like that from "Spooky" Mulder, but not Dana Scully.
Scully: I thought that you'd be pleased that I opened myself to extreme possibilities.
Mulder: Dana... open yourself up to extreme possibilities only when they're the truth.
Mulder: At the age of six, Luther Boggs slaughtered every pet animal in his housing project. When he was thirty, he strangled five family members over Thanksgiving dinner and then sat down to watch the fourth quarter of the Detroit-Green Bay game.
Scully: Luther, if you really were psychic -
Luther Boggs: I'd have known you lied. That there never was a deal. I know you tried.
Mulder: I tore this off my New York Knicks t-shirt. It has nothing to do with the crime.
Mulder: Dana, after all you've seen, after all the evidence, why can't you believe?
Scully: I'm afraid. I'm afraid to believe.
Scully: Last time you were that engrossed, it turned out you were reading the Adult Video News.
Scully: You set us up. You're in on this with Lucas Henry. This was a trap for Mulder because he helped put you away. Well, I came here to tell you that if he dies because of what you've done, four days from now nobody will stop me from being the one that'll throw the switch and gas you out of this life for good, you son of a bitch!!!
Boggs: Dana... (in Mulder's voice) You're the one who believed me.
Scully: No! No, I do not believe you!
Boggs: If you don't believe me, maybe you'll believe yourself.
Scully: Did Boggs confess?
Mulder: No, no, it was five hours of Boggs' "channeling". After three hours I asked him to summon up the soul of Jimi Hendrix and requested "All Along the Watchtower." You know, the guy's been dead twenty years, but he still hasn't lost his edge.
Brad Dourif receives the "special guest star" credit.
James Wong and Glen Morgan won a Digital Hollywood Award in the category "best digital writer" for this episode.
James Coblentz won a Monitor Award for "best editing" for this episode.
Don Davis, who plays Scully's father, has appeared alongside David Duchovny in Twin Peaks.
Actress Sheila Larken is the wife of X-Files Executive Producer R. W. Goodwin.
In the scene where Scully's father appears in her apartment silently mouthing words, actor Don Davis was actually reciting the Lord's Prayer.
The names of the two killers - Luther Lee Boggs and Lucas Jackson Henry - are a division of the name of real-life serial killer Henry Lee Lucas.
Movie Reference: Silence of the Lambs
This 1994 episode has many similarities to the 1991 film and 1988 book, including using a killer to catch a killer, a female FBI agent as hero, the fake offer made to the incarcerated killer, the final chase through a dark labyrinth, and the significance of the hero's father's death (and the incarcerated killer's interest in this).
Episode Title: Beyond the Sea.
The title of the episode refers to the song "Beyond the Sea" which is adapted from the French song "La Mer" by Charles Trenet. The version that is heard in this episode is sung by Bobby Darin and is probably the most known version of the song.
Scully: Good sailing, Ahab.
William Scully: Goodnight, Starbuck.
Ahab and Starbuck are two fictional characters in Herman Melville's novel Moby-Dick that was released in 1851. The book follows the adventures of the crew of the Peqoud on a whaling expedition. Ahab is the captain of the ship and Starbuck is the First Mate.
Mulder: I tore this off my New York Knicks t-shirt.
The New York Knicks are a professional basketball team in the NBA, of which Mulder is apparently a fan.