Myka: I know, I just thought it would be nice if we could spend some time together.
Artie: Maybe after we find the artifact, go for dinner and a movie.
Myka: Really?
Artie: No!

Myka: Is this really how it's going to be?
Artie: I don't know what you're talking about.
Myka: You can't keep freezing me out because I supported Helena joining the warehouse.
Artie: Oh, it's Helena now, is it? If it's all right with you, I'll just keep calling her the villain.

Pete: Myka, check it out. We're...
Myka: Jack and Rebecca.
Pete: I was gonna say still hot, but yes, that, too.

Claudia: I imagine... losing a child is the worst pain a person can go through.
Helena: No, actually. When I tracked them down, what I did to the men who killed my daughter... that's the most pain a person can go through.

As Charlie talks to Pete and Myka, he sits down and has a lit cigarette. The camera cuts to Pete and Myka, then cuts back to him a second later and he's now holding an unlit cigarette.

Pete: Get your ass to Mars!

In the 1990 movie Total Recall, Douglas Quaid leaves a recorded message for his amnesiac self that he knows will see the message in the future, telling him to go to Mars and fight the corporation.

Myka: What about the butterfly effect?

The "butterfly effect" as it applies to time travel is considered to have originated with author Ray Bradbury. In his 1952 story, "A Sound of Thunder," Bradbury writes of a time travel expedition to the age of dinosaurs which goes awry wen someone steps on a single butterfly. When the travelers return to the past, they discover vast escalating changes based on the one seemingly insignificant death of a creature.

As noted there, "You step on a mouse, you annihilate one, a thousand, a million possible mice. For want of ten mice, a fox dies. For want of a fox, a lion starves. For want of a lion, infinite billions of life forms cease to exist. A caveman goes hunting, but you, friend, have stepped on all his lions. The caveman starves. From his loins might have sprung ten sons. From these a hundred. Kill this one man, you destroy a race of people, an entire history of life. Europe remains forever a dark forest. Step on a mouse, you leave your print like a grand canyon across eternity."

Helena's time travel circuitry:

One piece of circuitry on the time machine is the flux capacitor from the Back to the Future movies.

Claudia: Pete and Myka's Excellent Adventure!

Bill and Ted's Excellent Adventure is a 1989 movie about two slackers who end up obtaining a time machine and going back and forth throughout time, collecting historical figures for their class assignment.

Pete: 99... would you believe the credenza?

In the 1960s TV series Get Smart, agent Maxwell Smart would often utter some version of this line to his female partner, Agent 99.

Rebecca Sinclair is a former Warehouse agent who lost her partner Jack Secord when he sacrificed himself to contain an artifact in St. Louis, in the first-season episode "Burnout".

In 1961, Charlie Martin mentions the Man Ray camera. As shown earlier in the episode "Age Before Beauty", the camera won't be found until 2010, when it's used to trade youth between young models and older women.

When Myka talks about the last time they had trouble with an artifact that went through the U.S. postal service, she's referring to the events of "Beyond Our Control", where a televisual duplication device is lost in the mail for decades and eventually falls into the wrong hands.