The glyph/code spells out PETER.

The previous episode's clue to this episode was a griffin tattoo on the arm of the Artist's first victim. A griffin is a hybrid animal, just like the creature here.

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 creatures grow) 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?

The Observer appears behind the reporter on the TV as Charlie and Sonia watch the news.