Trivia: The glyph cipher spells WALTER.
As "The Child" began writing down the intersection of York /Glenway, he starts out by grasping the pen such that it is clenched between his middle and ring fingers. As the shot goes to a closeup of his hand, the pen is being held by the fingertips of his thumb, index and middle fingers. When the camera pulls back, he is clenching it again between his middle and ring fingers.
Trivia: Pete's confusion over the G.I. Joe figure is a clue to the revelation in the season finale, "There's More Than One of Everything."
Trivia: The Artist's first victim, Tattooed Girl, has on her left arm the image of a griffin-a creature with the body of a lion and the head of an eagle. This is a clue toward the next episode, "Unleashed."
Trivia: The Observer appears at the end on a sidewalk as the Child rides by.
1st Demo Guy: What do you think this was?
2nd Demo Guy: I don't know. It's old.
1st Demo Guy: Oh good. That narrows it down.
Broyles: Dr. Bishop? Any thoughts?
Walter: Perhaps. First I need a piece of special equipment. My turntable.
Broyles: Is that some kind of lab equipment?
Walter: No, no, a turntable. Record player. You enjoy music, don't you, Mr. Broyles? Well imagine the agony of having an extensive record collection and having no means to play it.
Peter: The agony.
Broyles: I'll have someone get right on it.
Walter: Unless you have an IQ higher than mine, I am not interested in what you think.
Peter: Walter. Olivia's here, she needs to talk to you. Walter!
Walter: Could she come back later? I'm about to step in the bath.
Peter: No, she can't come back later. It's the middle of the night. She needs to talk to you right now.
Walter: (comes out of the bathroom) Honestly, Peter, can't a man get... Agent Dunham. Peter, why didn't you tell me Agent Dunham was here?
Peter: I'm pretty sure I did.
Walter: Pheromones. Undetectable chemicals that nonetheless affect our behavior, our sex drive...
Peter: (points to Walter's open bathrobe) Hey, speaking of sex drive...
Walter: Oh, Peter, don't be such a prude. I'm sure Agent Dunham knows what a penis looks like. Don't you, Agent Dunham?
Peter: My father, ladies and gentlemen.
Walter: My dear, there is much that is unexplained. Until it is.
Peter: In short, he has no idea.
Olivia: Walter, the last time you used that thing, you drilled it into the guy's head.
Walter: If you think he'll find it disagreeable... I suppose it could be modified.
Peter: Really? You didn't think to mention that to the last guy?
Walter: After that, it's a simply a matter of synthesizing the impulses. Think of it as creating artificial vocal cords.
Peter: Simple. Like making an omelet.
Walter: Actually, son, a good omelet is far more complex, eh?
Walter: "Cannot Build Phallic Puzzles In The Lab"...
Peter: What is he doing?
Astrid: Mnemonics. You know, like a rhyme or phrase to help memory. Like, uh, HOMES stands for the Great Lakes. That's Huron...
Peter: I'm familiar with that. Why is he doing it?
Music: Love and Happiness (Al Green), You Fall To Pieces (The Shore)
Norway: April 19, 2009 on TVN
UK: April 19, 2009 on Sky1
Finland: May 11, 2009 on MTV3
Germany: July 6, 2009 on ProSieben
Sweden: July 9, 2009 on Kanal 5
Belgium: July 16, 2009 on RTBF2
France: July 29, 2009 on TF1
Poland: December 17, 2009 on TVN
Slovakia: January 24, 2010 on Markiza
Czech Republic: March 26, 2010 on Nova Cinema
Blair Brown is credited but doesn't appear.