In the beginning of the episode, when Sam is reading the email from Rebecca, when Sam says "from my friends at Stanford," you can see a black microphone with a red circle around it fastened inside the door.
Trivia: Sam's email address is email@example.com.
The way the Winchesters parked looks like they came in driving towards the intersection. But that is impossible given the fact that it is a dead end. Even if they did reverse in, they still would have seen the crime scene coming in. Plus, the police are still putting up the crime scene wrap several hours in.
Rebecca Warren's Email to Sam
"hey sam -
wanted to update you; wasn't sure if you'd heard the news, zach was arrested for killing his gf. sounds crazy, i know - but he's charged with murder. cops say they have dna, fingerprints, all kinds of evidence... he didn't do it!! this all feels so unreal.
just thought you'd like to know"
When they first come across the shapeshifter in the sewer and Dean gets hit he is holding his left arm yet when they leave via the ladder is holding his right arm as if it's hurt.
When the shape-shifter leaves to go to Rebecca's he throws a tarp over Sam. When Sam is struggling with the ropes the tarp is shown hanging off of his shoulder. The camera changes to show Dean tied up nearby and when it returns to Sam the tarp is gone.
At the end of the episode when Sam is saying goodbye to Rebecca and she hugs him, you can see she is wearing a huge silver bracelet. However, after they are done hugging, she is no longer wearing a bracelet.
Early in the episode Rebecca says that the security tape shows her brother coming home at 10:30 PM and his girlfriend was killed just after that but when they all look at the tape later in the episode the time on the tape shows 10:04 PM and she said that that the girlfriend's time of death was 10:30.
If you watch the opening scene, it doesn't match up when it is played out near the end of the episode. Shapeshifter Dean is no longer trying to open the door when the SWAT team moves in, and they tell him to drop the knife too many times.
At the end of the episode Dean took his necklace back from shapeshifter Dean, but he never took his ring back.
The e-mail from Becky is dated the 5th of December, but this episode takes place in March.
When Sam and Dean go down into the sewer the sun is out but when they come out of the sewer a minute later to chase the shapeshifter it is dark outside.
Trivia: Channel 6 KJFT is made up for the show. There is no such station in St. Louis.
The sun doesn't usually rise until about 6:30 a.m. in St. Louis. If this episode was supposed to take place in March then at 5:30 a.m. it would still have been dark outside.
Sam knew Dean was the shapeshifter because he grabbed the keys with his left hand after being hit in the arm. However, when Dean was running around looking for the shapeshifter he was holding the gun in his left hand without any pain.
The time scale in this episode is way off. The events of the teaser (where Dean/Shapeshifter attacks Becca) take place one week after Dean and Sam first head towards St. Louis. However, Dean/Shapeshifter attacks Becca on the second night after they have arrived in St Louis, meaning that it took them six days to travel 400 miles (before they turn back, Dean claims that St. Louis is "400 miles behind them"). Even with stopping, it is highly unbelievable that they would take that long.
When Sam kicks the shapeshifter Dean his feet are tied, but after he cuts the rope from his hands he gets up and the rope binding his feet together is gone.
Trivia: Sam's e-mail contacts and the subject matter of each one that can be seen are: Rebecca Warren (about Zach) - Bad News, Jerry Wanek - Where are you?!, John Marcy - Re: Still b (rest unknown), Mary Ann - WTFRU Mister( rest unknown) and Stanislava Shmakin- Re: Get together this wk?
Trivia: As established later in the episode "The Benders," this episode takes place on or about March 7, 2006.
The closed captioning for the episode reveals that Poison Whiskey by Lynard Skynard was supposed to play during Sam's fight with the Dean/Shapeshifter, the lyrics even run in full in the captions though a regular dramatic piece of score music is heard instead.
Dean: Hey. Remember when I said this wasn't our kind of problem?
Dean: Definitely our kind of problem.
Dean: So the neighbor's dog went psycho right around the time Zach's girlfriend was killed.
Sam: Animals can have a sharp sense of paranormal.
Dean: Yeah, maybe Fido saw something.
Dean: Sam, the guy's walkin' around with my face. Okay, it's a little personal, I wanna find him.
Sam: What are you gonna do to me?
Shapeshifter Dean: I'm not gonna do anything, Dean will, though.
Sam: You'll never catch him.
Shapeshifter Dean: Oh, it doesn't matter. Murder in the first? Of his own brother? He'll be hunted the rest of his life.
Rebecca: What did you call it?
Shapeshifter Dean: A shapeshifter. Yeah, maybe we're crazy, but what if we're not? I mean, look, you said it yourself, that Zach was in two places at once, now tell me how that can happen?
Rebecca: Okay, so this thing, it can make itself look like anybody?
Shapeshifter Dean: That's right.
Rebecca: Well, what is it? Like a genetic freak?
Shapeshifter Dean: Maybe...evolution is about mutation, right? So maybe this thing was born Human but was different, hideous and hated... until he learned to become someone else.
Shapeshifter Dean: I must say, I will be sorry to lose this skin. Your brother's got a lot of good qualities - you should appreciate him more than you do.
Sam: We've gotta find a phone, call the police!
Dean: You're gonna put an APB out on me?
Dean: I really wish things could be different, you know, I wish you could just be Joe College.
Sam: Nah, that's okay. You know, truth is, even at Stanford, deep down, I never really fit in.
Dean: Well, that's cuz you're a freak.
Sam: Yeah, thanks.
Dean: Well I'm a freak, too. I'm right there with you, all the way.
(talking about the shapeshifter)
Dean: Argh, the thought of him driving my car.
Sam: Ah come on.
Dean: It's killing me!
Sam: Let it go.
Dean: I think we're close to its lair.
Sam: Why do you say that?
Dean: Because there's another puke-inducing pile next to your face.
Sam: Ughh, gah!
Shape-Shifter Dean: Even when we were kids, I always kicked your ass!
Dean: You know, I gotta say, I'm sorry I'm going to miss it.
Sam: Miss what?
Dean: How many chances am I going to have to see my own funeral?
Dean: All right, what are we doing here at 5:30 in the morning?
Sam: I realized something - the videotape shows the killer going in but not coming out.
Dean: So he came out the back door.
Sam: Right, so there should be a trail to follow, a trail the police would never pursue.
Dean: Because they think the killer never left, they caught your friend Zach inside. (sotto voce) Still don't know what we're doing here at 5:30 in the morning.
Sam: Hey, Bec, can we take those beers now?
Rebecca: Uh, sure.
Sam: Hey, ah, maybe some sandwiches, too?
Rebecca: What do you think this is, Hooters?
Dean: (sotto voce) I wish.
Dean: Sam wears women's underwear.
Sam: I've been listening, I'm just busy.
Dean: All right, but first I want to find that handsome devil and kick the holy crap out of him!
Dean: Man, it's not even a good picture!
Sam: It's good enough.
Dean: That better be you, Sam, and not that freak of nature!
Sam: Yeah, it's me. He went to Rebecca's, looking like you.
Dean: Well, he's not stupid. He picked the handsome one.
Shape-shifter Dean: He's sure got issues with you. You got to go to college. He had to stay home. I mean, I had to stay home, with Dad. You don't think I had dreams of my own? But Dad needed me. Where the hell were you?
Sam: Where is my brother?
Shape-shifter Dean: I'm your brother. See, deep down, I'm just jealous. You've got friends, you could have a life. Me? I know I'm a freak. And sooner or later, everybody's gonna leave me.
Sam: What are you talking about?
Shape-shifter Dean: You left. Hell, I did everything Dad asked me to and he ditched me, too. No explanation, no nothing, just poof! Left me with your sorry ass. But still, this life... it's not without its perks. I meet the nicest people! Like little Becky. You know... Dean would bang her if he had the chance. Let's see what happens.
Dean: I hate to say it but that's exactly what I'm talking about. You lie to your friends 'cause if they knew the real you, they'd be freaked. It's just... it'd be easier if...
Sam: ...If I was like you.
Dean: Hey, man, like it or not, we are not like other people. But I'll tell you one thing. This whole gig... it ain't without perks! (hands Sam a gun with silver bullets in it to kill the shape-shifter)
(after Dean finds out that Sam's friend, Zach, has been put in jail for murdering his girlfriend)
Dean: Dude, what kind of people are you hanging out with?!
Dean: Look, it sucks. But with a job like this you can't get close to people. Period.
Sam: You're kind of anti-social, you know that?
Dean: Yeah, you know. Whatever.
Dean: You kidding? You still keep in touch with your college buddies?
Sam: Why not?
Dean: Well, what exactly do you tell them? You know, about where you've been? What you've been doing?
Sam: I tell them that I'm on a road trip with my big brother. I tell them I needed some time off after Jess.
Dean: Oh, so you lie to them?
Sam: No. I just don't tell them... everything.
Dean: Yeah... that's, that's called lying. Hey man, I get it. Telling them the truth is far worse.
Creator Eric Kripke was particularly proud of "Skins," because it was the first time they started to dig deeper into the characters. Co-executive producer John Shiban seconds the feeling: "The episode really worked as a thriller, a great supernatural mystery."
Denmark: February 12, 2006 on TV3
Portugal: November 13, 2006 on AXN
France: January 15, 2007 on TF6
Italy: March 20, 2007 on RaiDue
Germany: November 19, 2007 on ProSieben
The Netherlands: August 10, 2008 on NET5
In an interview in TV Guide, Eric Kripke, the show creator admitted that he got so many requests from the viewers to see Jensen and Jared with "less on", that he created this episode for Jensen to be shirtless, and added a scene in the episode "Hell House" for Jared to be shirtless to please the fans.
Music: In-A-Gadda-Da-Vida (Iron Butterfly), Poison Whiskey (Lynyrd Skynyrd), Hey Man, Nice Shot (Filter), All Right Now (Free)
Sign: Drive Safe, America!
Refers to the traffic school launched in 1974 to provide traffic safety instruction nationwide.
Rebecca: What do you think this is - Hooters?
Hooters is a chain of restaurants with a relaxed beach-theme. Its also famous for its staff of Hooters girls.
Dean: You mean like a Vulcan Mind meld?
Referencing the Star Trek Universe and the ability for Vulcans to meld with another's mind using a special position of the fingers on the face of the other person. Also, director Robert Duncan McNeil starred in Star Trek: Voyager as Lt. Paris.
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