Ash tells Sam that he went to MIT, "It's a school in Boston." MIT is actually in Cambridge.
When Sam and Dean are about to stop the clown from killing a little girl's parents in the house, Sam is in a room that is dark when we get a shot of him. Then it is lit when we get a shot of Dean with the room in the background. The light is on then off depending on the camera angle.
Dean supposedly opens the steam valve by turning the handle down, perpendicular to the horizontal point. In reality, that closes off steam. A handle running parallel to the pipe means the steam line is open.
In the scene where Sam and Dean are walking down a road and discussing Dean's lack of feelings, Sam is/isn't holding a cell phone depending on whether it is a close/far shot.
After Sam stabs the clown, Dean pulls the knife that was under his arm out and throws it on the floor. The camera cuts to Sam, and then Dean turns the steam off and is shown pulling out the same knife from the exact same spot again.
Near the end of the episode when Dean is taking the last drink from the beer bottle, his hand switches position from the neck to the bottom depending on the camera angle.
Trivia: This is the first episode in which Sam and Dean cry together.
Sam: More murders?
Dean: Two more last night. Apparently they were ripped to shreds, and they had a little boy with them...
(Sam tries to complete Dean's sentence)
Sam: ...who fingered a clown.
(Dean gives Sam a strange look)
Sam: Where did you learn to do all this?
Ash: MIT. Before I got bounced for fighting.
Ash: It's a school in Boston.
Sam: Well, before we go stabbing things into Cooper, we're gonna wanna make damn sure it's him.
Dean: You're such a stickler for details, Sammy.
Sam: No, no, no. That's not what this is about, Dean. I don't care how you deal with this, but you have to deal with it, man! Listen, I'm your brother, all right? I just want to make sure you're okay.
Dean: Dude, I'm okay! I'm okay, okay? I swear, the next person that asks me if I'm okay, I'm gonna start throwing punches!
(abandoning the minivan)
Sam: You really think they saw our plates?
Dean: Don't wanna take the chance. Besides, I hate this freaking thing anyway.
Second Girl: Mommy, Daddy, they shot my clown!
Dean: You don't know? I thought that, once the demon was dead and the fat lady sings, you were going to take off, head back to Wussy State.
Sam: I'm having second thoughts.
Sam: Yeah, I think. Dad would've wanted me to stick to the job.
Dean: Since when did you give a damn what Dad wanted? You spent half your life doing exactly what he didn't want, Sam.
Sam: Since he died, okay?
Ash: You ever been struck by lightning? It ain't fun.
Dean: (to Ellen) Was there an article in Demon Hunters Quarterly that I missed? I mean, who are you? How do you know about all this?
Dean: Excuse me. We're looking for a Mr. Cooper. Have you seen him around?
Amazing Papazian: What is that? Some kind of joke? (removes his glasses, showing he's blind)
Dean: Oh God, I'm sorry...
Amazing Papazian: You think I wouldn't give my eye teeth to see Mr. Cooper, or a sunset, or anything at all...?
Dean: (aside, to Sam) Want to give me a little help here?
Sam: Not really.
Dwarf Clown: Hey, Barry, is there a problem?
Amazing Papazian: Yeah, this guy hates blind people.
Dean: No, no I don't...
Dwarf Clown: Hey, buddy, what's your problem?
Dean: Nothing, it's just a little misunderstanding.
Dwarf Clown: Little? You son of a bitch...
Dean: No, no, no, I'm just... can somebody tell me where Mr. Cooper is? Please?
Sam: You're right.
Dean: 'Bout what?
Sam: About me and Dad. I'm sorry that the last time I was with him I tried to pick a fight. I'm sorry I spent most of my life angry at him. I mean, for all I know he died thinking that I hate him. So you're right. That what I'm doing right now is too little...too late. I miss him, man and I feel guilty as hell. And I'm not all right. Not at all. But neither are you. That much I know. I'll let you get back to work.
Mr. Cooper: You two have never worked a show in your lives before, have you?
Dean: Nope. But we really need the work. So... and ah, Sam here's got a thing for the bearded lady.
Jo: Am I going to see you again?
Dean: Do you want to?
Jo: I wouldn't hate it.
Dean: Hey man.
Dean: By the way, uh, I dig the haircut.
Ash: All business up front, party in the back.
Ash: If this fugly bastard raises its head, I'll know. I mean I'm on it like Divine on dog dookie.
Dean: You got to be kidding me, this guy's no genius, he's a Lynyrd Skynyrd roadie.
Ash: I like you.
Dean: You still bust out crying whenever you see Ronald McDonald on the television.
Sam: At least I'm not afraid of flying.
Dean: Planes crash!
Sam: And apparently clowns kill.
Dean: Oh God, please let that be a rifle.
Jo: Nah, I'm just real happy to see you.
(driving a minivan)
Dean: This is humiliating. Feel like a freakin' soccer mom!
Sam: All right, Dean, it's just we've been at Bobby's for over a week now and you haven't brought up Dad once.
Dean: You know what, you're right. Come here, I want to lay my head gently on your shoulder. Maybe we can cry, hug, maybe even slow dance.
The scene with the clown chair in Mr. Cooper's office wasn't in the original script. Like the other comedic beats of the episode, the scene was ad-libbed on set to make Sam (and Jared Padalecki) more uneasy.
Music: Time has Come Today by The Chambers Brothers, Shambala by 3 Dog Night, Do That to Me One More Time by Captain & Tenille, Mudd Walk by Bad Poodle
The end credits feature "In memory of our friend, Peter Ellis." Peter Ellis directed two episodes, "Bloody Mary" and "The Benders," and died in April 2006.
Denmark: November 12, 2006 on TV3
UK: February 11, 2007 on LIVING
Portugal: March 19, 2007 on AXN
France: September 17, 2007 on TF6
Germany: December 17, 2007 on Premiere Serie
Italy: June 24, 2008 on Rai2
The Netherlands: December 14, 2008 on Net 5
Everybody Loves a Clown was a 1965 song released by Gary Lewis & The Playboys. It went to #4 on the Hot 100.
Dean: You still bust out crying every time you see Ronald McDonald on TV.
Ronald McDonald is the main McDonald's restaurant mascot. He is a clown wearing red and yellow (McDonald's colors).
Dean: Check it out. 5-0.
This is a reference to the popular TV series Hawaii Five-O (1968-1980). It was on CBS and had 282 total episodes. Created by Leonard Freeman, Hawaii Five-O was an elite investigative unit that reported to the Governor of Hawaii.
Nintendo DS Game
The sound effects coming from the little boy's Nintendo DS during the scene in the fun house was from the video game Donkey Kong.
Dean: I know what you're thinking - Why'd it have to be clowns?
This is an allusion to the Indiana Jones line from Raiders of the Lost Ark - "Why'd it have to be snakes?"
Ash: I mean I'm on it like Divine on dog dookie.
This quote refers to famous Drag queen, Divine, who became infamous after completely chewing and swallowing actual dog feces in the film Pink Flamingos.
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