When Meg boasts that John is her prisoner, the boys visit a friend of their father's to get information about demonic possessions and ways to trap a demon. It turns out Meg is not what she appears.
At the end of the episode, when Sam is driving his dad and Dean to the hospital, Sam looks in the rearview mirror to look at Dean. He sees Dean straight on, which would be impossible unless the rear view mirror were twisted around at almost a 45-degree angle. And even then, Sam's head would be blocking the view, since Dean is behind him and against the car door on the same side.
As Sam is checking to make sure John isn't possessed, he splashes him with holy water. However, the very first time Sam splashes him, although you hear the noise like water is coming out of the flask, no water comes out.
When Dean shoots the possessed man who was attacking Sam in the street, you can see he falls over with his legs staying on top of Sam's. But when the camera pans out the man is lying farther away and his legs are nowhere near Sam's.
Both Meg's hands and feet were tied and yet when Sam and Dean are untying the rope they barely have to work to get out the knots on her hands and they don't even untie her feet yet in the next shot the rope is lying untied on the floor.
When Dean hits Meg, her hair gets messed up, but in the next shot, her hair is undisturbed.
When the possessed John is "killing" Dean he has blood coming out of his mouth and dripping down his chin. Then they show John but when they go back to Dean he doesn't have any blood on his face.
Sam: I want to know why?
John: (possessed) What? why, I killed mommy and pretty little Jess?
John: (possessed) You know, Sam never told you this, but he was going to ask Jess to marry him. Been shopping for rings, and everything. You want to know why?!
John: (possessed) Because they got in the way.
Sam: In the way of what?!
John: (possessed) In the way of my plans for you and all the other kids like you.
Bobby: (handing Dean one of two flasks) Here you go.
Dean: What is this, holy water?
Bobby: That one is. This is whiskey.
Dean: Boy, you and Dad are a lot more alike that I thought, you know that? You both can't wait to sacrifice yourself for this thing, but you know what, I'm gonna be the one to bury you!
Meg: He begged for his life with tears in his eyes. He begged to see his sons one last time and that's when I slit his throat.
Dean: For your sake, I hope you're lying. Cause if it's true, I swear to God I will march into hell myself and I will slaughter each and every one of you evil sons of bitches, so help me God!
Meg: That's kind of a turn-on, you hitting a girl.
Dean: You're no girl.
Dean: I always wanted to be a fireman when I grew up.
Sam: You never told me that!
Dean: Let him go, or I swear to God...
John: (possessed) What? What are you and God gonna do?
John: (possessed) Your dad, he's in here with me. Trapped inside his own meat suit. He says "Hi," by the way.
Dean: Listen, you mind just getting this over with, huh, 'cause I really can't stand the monologuing.
Sam: I'm gonna kill you.
John: (possessed) Oh, that would be a neat trick. In fact, here, make the gun float to you there, psychic boy.
Meg: I swear, after everything I heard about you Winchesters, I'm a little underwhelmed. First, Johnny tries to pawn off a fake gun and then he leaves the real gun with you two chuckleheads. Lackluster, man. I mean, did you really think I wouldn't find you?
Dean: Actually, we were counting on it.
Sam: And these, uh, these protective circles, they really work?
Bobby: Hell yeah, you get a demon in one, they're trapped, powerless. It's like a satanic roach motel.
Dean: You know that guy I shot? There was a person in there.
Sam: You didn't have a choice, Dean.
Dean: Yeah, I know, that's not what bothers me.
Sam: Then what does?
Dean: Killing that guy, killing Meg - I didn't hesitate, I didn't even flinch. For you or Dad, the things I'm willing to do or kill, it scares me sometimes.
John: (possessed) What? You're the only one who can have a family? You destroyed my children. How would you feel if I killed your family? Oh... that's right, I forgot, I did. Still, two wrongs don't make a right.
John: I'm surprised at you, Sammy. Why didn't you kill it. I thought we saw eye to eye on this--killing this demon comes first, before me, before everything.
Sam: No, sir, not before everything.
John: (possessed) Sam, he's clearly John's favorite. Even when they fight, its more concern than he's ever shown you.
Dean: Yeah, I bet you're real proud of your kids, too. Huh? Oh wait, I forgot, I wasted them!
Bobby: You think you guys invented lying to the cops? I'll figure something out.
Meg: You know, if you wanted to tie me up, all you had to do was ask.
Meg: You son of a bitch, you promised!
Dean: I lied!
Dean: Where's our father, Meg?
Meg: You didn't ask very nice.
Dean: Where's our father, bitch?
Meg: Jeez, you kiss your mother with that mouth? Oh I forgot, you don't.
Sam: Hey, uh, Dean? Ummm...You saved my life back there.
Dean: So I guess you're glad I brought the gun, huh?
Sam: I'm trying to thank you here.
Dean: You're welcome.
Dean: What's happening? Is there a fire?
Firefighter: Sir, you have to stand back.
Dean: Well, I got a Yorkie upstairs and he pees when he's nervous.
Dean: No, you're gonna burn in Hell, unless you tell us where our dad is. (no response) Well at least you'll get a nice tan.
Eric Kripke's original plan was to kill John Winchester at the end of season one. The boys were supposed to come out of the car crash, barely alive, and John was supposed to die in their arms. Eventually, they changed their minds because the finale was already pretty grim and Eric Kripke feared that killing John would have framed the show in too much darkness.
The secluded cabin in the woods was actually built on stage. In the Supernatural: The Official Companion - Season 1, production designer Jerry Wanek explains that the location had to be particularly atmospheric because the Winchesters were going to spend a lot of time in it. So they had to built a forest and then the cabin.
Denmark: June 4, 2006 on TV3
France: March 5, 2007 on TF6
Portugal: March 5, 2007 on AXN
Belgium: August 29, 2007 on VT4
The Netherlands: November 30, 2008 on NET5
This marks Bobby's first appearance.
"Bobby Singer", friend of the family Dean seeks out for help, is a shout-out to executive producer Robert Singer.
Music: Bad Moon Rising by Creedence Clearwater Revival, Fight the Good Fight by Triumph, and Turn to Stone by Joe Walsh.
Dean: Oh we're going for it, baby. Head spinning, projectile vomiting, the whole nine yards.
Referring to the 1973 horror movie The Exorcist, in which a young girl is possessed by a demon. The movie was written by William Peter Blatty, who also wrote the novel it was based upon.
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