Lucas Hellinger: That's astounding. It's hard to imagine that you're able to fit that much microcircuitry into such a small space.
Dyson Frost: Well, I'm brilliant, right?

Alda Hertzog: I just have to ask--what's with all the dominoes?
Dyson Frost: This is my garden... and the white ones chart the path of my escape.
Alda Hertzog: That makes no sense at all.
Dyson Frost: It does if you live in my head.

Dyson Frost: The point is, once we've glimpsed it, the future wants to happen. It gains weight. It's like atmospheric pressure bearing down. And if we want to escape that pressure, we have to do something drastic.

Dyson tells Mark to turn right at the 31 road marker. However, Mark turns left.

"The Garden of Forking Paths" is the name of a famous short story written by Argentinian deceased author Jorge Luis Borges. Its original name is "El jardín de los senderos que se bifurcan".

Who is the mole working for?

In the previous episode, it was seemingly established that the second mole in the FBI stole Mark's gun. And that mole is working for Frost's "associates." But here we see that Frost has the gun, and his associates want him dead. So if the associates and their agent stole the gun, how did Frost get it? Alternately, how did Frost steal the gun from the evidence room on his own? Either the mole didn't steal the gun and Frost somehow did, or there's some kind of secret power play going on. Presumably this will be clarified in future, but it's confusing now.