There is a Dharma logo on the blast door map that hasn't been shown before - the flame. The arrow, the staff and the swan logos also appear on this map.

When Locke arrives at the Flightline Motel, a plane flies by in the background with the Oceanic Airlines logo on its tail.

When Locke retrieves the money from the bank, the number on the safety deposit box is 1516.

In a flashback, Locke welcomes Nadia, Sayid's old school friend (whom Sayid tortured and helped to escape), to her new home.

The episode title has a double meaning in that it refers to the lockdown in the hatch and also to Locke going down because of it.

On the map Locke sees, there are several Latin phrases. One is "Aegrescit Mendendo" - translated it means "The Remedy Is Worse Than The Disease".

The address on Henry Gale's driver's license is shown as: 815 WALNUT RIDGE RD, WAYZATA, MN 55391. If the numbers in the zip code are added together, they make 23. This coincides with the 8 and 15 in the house number.

Post Production Services: Technicolor Creative Services

Helen: Don't knock the obits. It's the nicest part of the paper - no-one ever says anything mean about people once they're dead.
Locke: Mmm, and here I am thinking the funnies are the nicest part of the paper.

Locke: It's too late, anyway, she's already long gone, Jack.
Jack: So, what's done is done?
Locke: That's right.

Henry Gale: Why do you let him talk to you like that?
(Locke grabs Henry)
Henry Gale: Hey, wait!
Locke: Shut up!
(Locke throws Henry into the armoury)

Kate: What about me? What do I got?
Jack: Hard to say but you're just playing for the fun of it.
Kate: Well, fun's not bad. You should try it some time.

Locke: You stole my kidney.
Cooper: I was dying.
Locke: You could've asked me. You could've just asked me.

Cooper: I killed myself off because there are two men out there who were gonna beat me to it.
Locke: Ohh, what'd you do? Steal their livers?

Locke: Who are you?
Henry Gale: My name is Henry Gale. I'm from Minnesota... and I crashed on this island just like you.

Jack: Wouldn't really be fair for you to go out and pick more mangos.
Sawyer: Oh, I got a hell of a lot more mangos. Wanna play real stakes, name 'em!
Jack: It's a pile of fruit, man.
Sawyer: And I want it back.
Kate: Should I go and get a ruler?

Sawyer: So, where'd you learn to play cards, Doc?
Jack: Phuket.
Sawyer: The hell you doin' in Thailand? What? Ya didn't think I'd know where Phuket is? Just 'cause I dropped out ninth grade, don't make me an idiot.

Locke: I trusted you, Henry, now you gotta trust me - that button has to be pushed!

Jack: Ten mangos.
Sawyer: Okay. I'll call you with the aspirin, raise you a bottle of amoxicillin.
Jack: Do you even know what amoxicillin is?
Sawyer: You may have been to Phuket, Doc, but I been to Tallahassee. Let's just say somethin' was burnin' and it wasn't from the sunshine.

Sawyer: When I asked you what you wanted for stakes, why didn't you ask for the guns?
Jack: When I need the guns, I'll get the guns.

Sawyer: Hey, Amarillo Slim. Think 'cause you watch poker on TV, you can tussle with the big boys?
Jack: I gotta head back to the hatch.
Sawyer: Hatch ain't going nowhere, Doc. How about you put your mangos where your mouth is?

Amarillo Slim, real name Thomas Austin Preston, Jr., is a professional gambler, famous for his poker skills, who won the main event at the World Series of Poker in 1972.

Sawyer: (to Hurley) Fun time's over, Mongo, why don't you hit the buffet?

Mongo was the giant gingerbread man in Shrek 2.

On the blast door map, to the left, it says "POSSIBLE CATASTOPHIC MALFUNCTION OF CERBERUS SYSTEM".

Cerberus was the three-headed hound of Hades in Greek mythology. He guarded the gates to Hades to prevent the dead from leaving and the living from entering.