The glyph/code spells out VISION.

Walter: It's possible we're dealing with a case of spontaneous human combustion.
Peter: I thought that was just a myth.
Walter: Oh, a myth is just an unverified fact.
Peter: Maybe she was hit by a tiny meteor.
Walter: It's also possible.

Walter: Matter is just energy waiting to happen. The average adult at rest contains enough potential energy to explode with the force of five very large hydrogen bombs.
Peter: You know, theoretically, you're actually right.
Walter: Ho ho ho ho! My son finally agrees with me. Agent Farnsworth, take a note of that.

Astrid: You know, Walter, working with you, it's amazing the sort of things you get used to.
Walter: You're not the first person to tell me that.

Walter: I was prone to hide things because I was afraid that someone would unlock all my secrets. I didn't realize the someone would be me.

Walter: Lab rule #1: Do not borrow Walter’s equipment without asking.

Olivia: I fell like I'm losing my mind.
Walter: Oh, I don't think so. If you were actually going insane, you'd likely have no idea what's happening. Take it from me.

Olivia: What process?
Emmanuel Grayson: To create super soldiers.
Olivia: Super-soldiers.
Emmanuel Grayson: Yes. Like Khan Noonian Singh.To defend us in the coming war.
Olivia: What war?
Peter: I'm sorry. The Khan?
Emmanuel Grayson: Yes.
Peter: As in The Wrath of...?
Emmanuel Grayson: Yes.
Peter: Let me guess. This war, it's against...
Emmanuel Grayson: The Romulans. Renegade Romulans from the future, here to change the timeline. The sworn enemy of the Federation.
Peter: The Federation. That would be the United Federation of Planets.
Emmanuel Grayson: Yes.
Peter: Hmm. And you know this because?
Emmanuel Grayson: I am the son of Sarek.
Peter: Which makes you Spock.
Emmanuel Grayson: Yes.
Peter: Well, Mr. Spock, thank you for your time. We'll let you get back to the bridge now.
Emmanuel Grayson: Live long and prosper.

Walter: I've seen this woman before. Why does she look so familiar?
Peter: Maybe because you dissected her twin sister yesterday. Remember? Blond girl about 5'7". Really well done. Melted fillings.
Walter: Oh, right.

in honor of and/or to cross-promote series creator J.J. Abrams, Alex Kurtzman, and Roberto Orci's involvement with the Star Trek movie that premiered three days after this episode first aired, there are numerous Star Trek references in the episode.

* Clint Howard was a guest star in three different incarnations of the TV series.
* His character is named Emmanuel Grayson: Grayson was Spock's mother's maiden name.
* Grayson mentions Khan Noonian Singh
* Grayson also describes the plot of the Abrams movie: Romulans time traveling to the past to alter history
* Grayson believes he's Spock, son of Sarek, and Leonard Nimoy appeared on the show as William Bell the next week.
* Grayson lives in apartment number 1701: a reference to the Enterprise's ID of NCC-1701.