Trivia: As Olivia stands outside Carl's house, a "Red Balloon Lager" label can be seen on a beer keg. This is a clue toward the next episode, "Bad Dreams."
The second time Walter is giving Charlie the ultrasound, you can clearly see him moving the sensor around quite a bit on Charlie's stomach, but on the screen everything is stationary, with the exception of the larva.
Trivia: The glyph code for the episode is "Peter."
Trivia: The Observer can be seen on Charlie's TV during the news broadcast, walking behind the reporter.
Astrid: Okay, well, we know what it's made of. We know that it moves through the sewers. So, can't we, I don't know, like, bait it or something?
Peter: Just so I'm clear--are you actually suggesting that we go down into the sewers and wait for this thing to eat us?
Astrid: Well, no...
Olivia: Walter, have you got any idea what kind of animal would be in a lab that could do this?
Walter: Well, judging by the wounds, I'd say two or three different ones, actually.
Peter: Right, a motley crew of lab animals got together and decided to exact their revenge on mankind.
Walter: If my theory is correct and the bat traits are dominant in the creature, then yes, I believe we can successfully lure it. Whether we can survive the encounter is the more intriguing question.
Walter: Check in on Agent Francis. Let's look in on our little friends.
Astrid: It didn't work.
Walter: Ever the pessimist. (pauses) Look.
Olivia: They're dying.
Charlie: What happens now?
Walter: Now you crap 'em out.
Walter: The spread of the digits, V-shaped. It's too wide for one of those creatures. Configuration closer to that of an eagle. Of course much, much larger.
Peter: Hey, we're looking for Big Bird.
Walter: Don't be ridiculous. Perhaps a pterodactyl.
Peter: It's an omelet.
Walter: It's not an omelet!
Peter: Oh, my...ugh! Walter, why is there an ear in the omelet?
Walter: It was an experiment. It was a protein-rich incubator. It was growing.
Peter: It was growing? That's perfect.
Walter: No, it's not perfect. You just ruined it.
Broyles: Whatever did this doesn't appear to be indigenous to the area.
Charlie: Well, wherever it is indigenous to, I don't want to live there.
Walter: How interesting.
Peter: Some would say disgusting.
Walter: This is quite delicious.
Peter: Where did you get that?
Walter: In the car, uneaten.
Peter: What is the matter with you?
Walter: Oh, forgive my son. He's been in a mood all day.
Peter: I just figured "don't eat the evidence" goes without saying.
Astrid: So this thing has the claws of a lion and the fangs of a snake?
Walter: It reminds me of a woman I once knew in Cleveland.
Peter: Walter, these punctures are over four inches apart. And that would make this snake eight-feet long.
Walter: Her name was Harriet something.
Olivia: How is everything?
Peter: Well, apparently you're looking for a lion-snake named Harriet.
Peter: Are you okay? Did you take something?
Walter: Psychedelics? No, not since Thursday, no.
Olivia: Walter, I need you to tell me what exactly you would need to create a genetic hybrid. Like, specific items, so I can see if Robert Swift bought any of it.
Walter: I would need some sodium bicarbonate and a house in he country, a place to be alone in my thoughts. Some Mahler for the late nights. And time. A lot of time.
Peter: I know. It's like he's on another planet.
Olivia: You mean that these are baby monsters?
Walter: Yes. We must collect them. Peter, a petri dish. (the larvae grow larger) Make it a bucket.
Astrid: I'm gonna be sick.
Walter: Two buckets!
Walter: Could you carry these, son?
Peter: Sure thing.
Walter: Be careful. We must be very gentle with them.
Peter: Right, 'cause we wouldn't want to hurt the monster babies.
Peter: Hey, Walter. Think we can wait down here to be mauled in silence, please?
Walter: I need to tinkle. Could either of you direct me to the facilities?
Peter: The facilities? You're in the sewer, Walter. You're knee-deep in the facilities.
Peter: Are you okay?
Walter: Yes. Although when I mentioned that the poison would kill me within the hour, did either of you happen to notice the time?
Music: No You Girls (Franz Ferdinand), Trashcan (Delta Spirit), Escape (The Pina Colada Song) (Rupert Holmes; sung by Joshua Jackson)
Original International Air Dates:
United Kingdom: April 26, 2009 on Sky1/Sky1 HD
Norway: May 10, 2009 on TVN
Finland: May 18, 2009 on MTV3
Germany: July 13, 2009 on Pro 7
Sweden: July 16, 2009 on Kanal 5
Belgium: July 23, 2009 on RTBF2
France: August 5, 2009 on TF1
Poland: January 7, 2010 on TVN
Slovakia: January 31, 2010 on Markiza
Czech Republic: April 2, 2010 on Nova Cinema
Kiersten Warren, who plays Charlie's wife Sonia in this episode, is the real-life wife of Kirk Acevedo, who plays Charlie.
Blair Brown is credited but doesn't appear.