When Sam and Dean discuss Dean’s description of the people in the prison killed by the ghost, Dean asks Sam "Are you from Texas all of a sudden?" Both Jared Padalecki (Sam) and Jensen Ackles (Dean) are from Texas.

Sam: I hate this plan, Dean.
Dean: Yeah, I got that the first ten times I heard it.

Special Agent Victor Henricksen: You think you're funny?
Dean: I think I'm adorable.

Special Agent Victor Henricksen: I’d say for you two, screwed to hell is a major understatement.
Dean: Well, where there's life there's hope.
Special Agent Victor Henricksen: See, that’s what I kept thinking as I was searching for your asses all over hell and gone.

Special Agent Victor Henricksen: Near went nuts trying to find you. Ask him.
Special Agent Carl Reidy: He near went nuts.

Dean: Don't worry, Sam. I promise I won't trade you for smokes

Dean: My roommate doesn't say much, how's yours?
Sam: Just keeps staring at me... in a way that makes me really uneasy.
Dean: Sounds like you're making new friends.

Sam: Dean, this is without a doubt the dumbest, craziest thing we've ever done. And that's in a long storied career of dumb and crazy.
Dean: Calm down. It's all part of the plan.
Sam: Really? So Henricksen showing up was part of the plan?
Dean: Yeah, the guy moves a little faster than I thought. Look, all we gotta do is find the ghost, put the sucker down, and then grab ourselves a couple of teardrop tattoos.

Dean: We may not be saints but we’re loyal and we pay our debts. Now that means something to me and it ought to to you.

Dean: You know, this chicken ain't half bad.
Sam: Great, finish mine.

Lucas: You talking to me? You talking to me?
Dean: Okay, another guy who’s seen Taxi Driver one too many times.

Lucas: Well, I wish I had a bat, so I could bash your frickin' head in.
Dean: Okay. Well, so much for the bonding-in-solitary moment.

Sam: How you doing?
Randall: I’m 54 years old, mopping the floors of a crapper with bars on the window. How do you think I’m doing?
Sam: All right. Bad icebreaker.

Randall: Why you inside, kid?
Sam: Cause I got an idiot for a brother.
Randall: That’ll do it.

Dean: That’s the Sammy I know. You’re like Clint Eastwood from Escape from Alcatraz.

Dean: Are you sure about this?
Sam: Pretty sure.
Dean: Yeah, well, considering the circumstances I'd like a little better then pretty sure.
Sam: Okay, really pretty sure.

(provoking Tiny)
Dean: Hey, I wanted to ask you, because I couldn't help but notice that you are two tons of fun. Just curious: is that, like, a thyroid problem, or is that some deep-seated self-esteem issue? 'Cause, you know. they're, uh, just donuts. They're not love.

Tiny: It's okay. My dad treated my brother and me like crap, right up until the day he died.
Dean: How'd he die?
Tiny: My brother shot him.

Sam: You heard it on the yard?
Dean: Yeah.
Sam: Dean, does it bother you at all how easily you seem to fit in here?
Dean: No, not really.

Mara Daniels: Do you have any idea how much trouble you're in here?
Dean: I've got a vague notion.

Sam: Thought we screwed before?
Dean: Yeah, yeah, I know. We gotta go deep this time.
Sam: Deep, Dean? We should go to Yemen.
Dean: Whoa. Not sure I’m ready to go that deep.

The pile of cigarettes that Dean wins at poker changes position depending on whether the camera is in front or behind him.

When Sam puts the lighter fluid on the bloodstain, he only spills a few drops. In the next show, the lighter fluid has grown to cover the entire patch of blood.

Episode Title: Folsom Prison Blues

"Folsom Prison Blues" is the title of a song by Johnny Cash.

Dean: I call this one "Blue Steel"

Reference to Derek Zoolander (Ben Stiller) in the movie Zoolander who uses the face "Blue Steel" when modelling.

Dean: (while his mugshot is being taken) Who looks better -- me or Nick Nolte?

Actor Nick Nolte was arrested in 2002 for drunk driving. His now infamous mugshot featured him wearing a Hawaiian print shirt and oddball hair.

Dean: I wish I had a baseball. You know, like Steve McQueen.

In The Great Escape, Steve McQueen's character throws a ball against the wall in order to pass the time while in prison.

Randall: She did this Charles Bronson thing with a hypodermic.

Charles Bronson played Paul Kersey in the 1974 film Death Wish. In the film, Bronson plays a vigilante cop.

Sam: Thought we screwed before?
Dean: Hell yeah, I know. We gotta go deep this time.
Sam: Deep Dean? We should go to Yemen.
Dean: Not sure I’m ready to go that deep.

In the Friends episode "The One With All The Rugby", Chandler fakes that he's moving to Yemen in order to get away from his crazy girlfriend.

Lucas: You talking to me? You talking to me?
Dean: Okay, another guy who’s seen Taxi Driver one too many times.

Lucas is quoting a line spoken by Robert De Niro character in Taxi Driver.