Caroline's last name is Farrell, according to the monitor screens. Priya's is Tsetsang.

In a very odd coincidence, on the same night this episode premiered, actor Adam Godley also appeared on a rerun of Numb3rs, "First Law (05x17)".

The opening sequence is omitted except for Joss Whedon's creator credit. The star credits are run afterward on-screen as the story continues.

The figure that appears at the 13:22 mark in Echo's scenario, holding a large piece of cheese, is The Cheese Man. The character previously appeared in Joss Whedon's series Buffy the Vampire Slayer, in the episode "Restless". There he was an inexplicable dream figure that offered people cheese, but was never explained.

Demir Gjokaj (pronounced "joke eye", BTW) plays the sniper-self Victor fights in his nightmare scenario. Demir is Enver's actual twin brother (yes, ladies, there's two of him!) and is more usually a real estate analyst. The writers encountered him at the DH Xmas party last year and decided to write him into a role.

Echo: Victor and Sierra--where are they?
Male Attendant #2: We... we don't use Active-codes here. We use your real names.
Echo: My real name is Echo.

Topher: I've tried homotropic and heterotropic stimulation.
Adelle: Haven't we all?

Topher: Adelle wants to see you.
Ivy: Did she say why?
Topher: Does she ever? Hey, Darth Vader kills lieutenants, not storm troopers.
Ivy: Thanks.

Adelle: You gave us extraordinary technology which will be used soon. The question is whether you have anything more to offer--whether you can accept radical change or if you'll buckle under pressure.
Topher: I don't buckle. Occasionally I swashbuckle.
Adelle: Yes, you're quite a pirate hero, swinging in and dismembering Nolan Kennard. If you try to keep secrets from the Corporation, you may have every expectation of being chopped into pieces yourself.

Adelle: I have seen the future, Mr. Langton. And it is not for the weak.

Nolan Kinnard: You know, this is a scenario I've never tried. Rigor mortis. The new Viagra.

Victor: In my scenario, I was constantly fighting myself, at war. Just trying to get home to my girl.
Sierra: In mine, I was constantly making love to you.
Victor: Oh?
Sierra: And then you'd turn into the rotting corpse of a rapist I killed.
Victor: Oh.

Paul: I'm not afraid to lose my life taking you down.
Adelle: I don't want to die.
Paul: Then only one of us is going to be disappointed.

Laurence Dominic: I guess I'm glad I never did kill you.
Echo: Don't get sloppy.

Echo: That's pretty cool and all, and I don't want to ruin your Highlander vibe...

A reference to the Highlander movies and the subsequent TV series. Starting with the first movie in 1986, the movies and the later series chronicle the adventures of a small subset of humanity known as Immortals. Immortals are found as orphans, taken in by humans, and upon their first death gain immortality. They can sense each others' presence, and are generally, but not inherently, inimical to one another. They can only be killed "for good" via decapitation, which unleashes their life force, their "Quickening." The opponent in a fight (assuming that's the cause of the decapitation) absorbs the loser's Quickening and becomes more powerful. The Immortals are doomed to pursue each other and fight down through the ages, much as Dominic believes himself doomed to fight his way through the Attic and battle Arcane.

Topher: ...And the quarterback's in jail for dog fighting.

A reference to Michael Vick, a fairly successful professional quarterback for the Atlanta Falcons, who was arrested and convicted of dog fighting, resulting in his serving jail time, filing bankruptcy, and, after being released from jail, released from the Falcons and subsequently being signed by the Philadelphia Eagles.

Topher: Does she ever? Hey, Darth Vader kills lieutenants, not storm troopers.

Topher is referring to the black-clad villainous figure first seen in Star Wars; A New Hope (1977). Rated one of the most iconic movie villains of all time, Darth Vader is the primary nemesis of the movies, until he turns from his evil ways and sacrifices himself in the last movie of the original trilogy, Return of the Jedi (1983). The second trilogy, prequels to the first trilogy, shows how Anakin Skywalker grew up to embrace the Dark Side and become Darth Vader. Topher's reference is to Vader's preferred method of discipline, by killing commanding officers who fail him, and to impress upon their successors the price of failure.

Laurence Dominic, the former head of security for the LA Dollhouse, was sent to The Attic as a result of the events occurring in "A Spy in the House of Love (1x09)."

Nolan Kinnard, who was responsible for Sierra/Priya's introduction to the Dollhouse, was killed as a result of the events in "Belonging (02x04)."