Jared Padalecki filmed this episode with a broken hand.
The lake cabin was also used in the horror movie, Devour, in which Jensen Ackles starred.
This episode was filmed at Buntzen Lake, Anmore, British Columbia, Canada.
Dean: You know, Sam, we are allowed to have fun once in a while. (indicates an attractive waitress) That’s fun.
Sam: People don't just disappear, Dean. Other people just stop looking for them.
Andrea Barr: (to Dean) Must be hard with your sense of direction. Never being able to find your way to a decent pickup line.
Sam: “Kids are the best?" You don’t even like kids.
Dean: I love kids.
Sam: Name three children that you even know.
Dean: I’m thinking!
Dean: (to young Lucas) So crayons are more of your thing. That's cool. Chicks dig artists.
Dean: (to Lucas) You're scared. It's okay, I understand. See, when I was your age, I saw something real bad happen to my mom, and I was scared, too. I didn't feel like talking, just like you. But see, my mom—I know she wanted me to be brave. I think about that every day. And I do my best to be brave. And maybe your dad wants you to be brave, too.
Dean: Oh, college boy thinks he’s so smart. (Sam laughs)
Sam: You know, um … what you said about mom … you never told me that before.
Dean: It’s no big deal … oh God, we’re not gonna have to hug or anything, are we?
Sheriff Jake Devins: So, we have a couple of options here. I can arrest you for impersonating government officials and hold you as material witnesses to Bill Carlton's disappearance. Or we can chalk this all up to a bad day, you get into your car, you put this town in your rear-view mirror, and you don't ever darken my doorstep again.
Sam: Door number two sounds good.
Sheriff Jake Devins: That's the one I'd pick.
Dean: I just don't want to leave this town until I know that the kid is okay.
Sam: Who are you? And what have you done with my brother?
Dean: You and Bill killed Peter Sweeney 35 years ago. That’s what the hell we’re talking about. And now you’ve got one seriously pissed off spirit.
Sam: It’s gonna take Andrea, Lucas, everyone you love. It’s gonna drown them and it’s gonna drag their bodies God knows where. So you can feel the same pain Peter’s mom felt. And then, after that, it's gonna take you, and it’s not going to stop until it does.
Sheriff Jake Devins: Yeah, and how do you know that?
Sam: Because that’s exactly what it did to Bill Carlton.
Sheriff Jake Devins: Listen to yourself, both of you. You’re insane.
Dean: I don’t really give a rat’s ass what you think of us.
When Dean circles the picture in the newspaper and hands the paper to Sam, the circle changes from around the picture and the girl's name, to just around the picture.
When Sam and Dean first talk to Will on the shore, a boom mike briefly dips into the shot, at the 5:09 mark.
When Will drowns, you can clearly see that the plug isn't in the sink. However, Will reaches into the water to unplug the sink though the plug was never there in the first place.
When Andrea gets in the bathtub, the water is at most an inch from the top of the tub. Then the lake water pours in, and yet in the next shot the water level has dropped by at least an inch.
Andrea presumably gets into the tub naked, since that's how people take baths. However, when Sam pulls her out, the modesty bikini that actresses wear during bathtub scenes is briefly glimpsed.
Though the episode takes place in Wisconsin, Water Wraiths originated in Scotland. The episode follows the tale of the Wraiths very closely, incorporating most of the story into the plot line. However, in the tale, Wraiths typically take the form of skinny, old women that dress in green, not of an angry little boy as this episode portrays.