A.R.I.A.: Jerry Shaw, you have been activated. Your compliance is vital.
Rachel Holloman: Do you think they could derail a train?
Jerry Shaw: They changed every traffic light to get us here. The woman, she called me on a stranger's cell phone who happened to be sitting next to me - never met the guy in my life. And then they broke me out of maximum security custody in a way I'm not even going to describe to you because it sounds crazy, and then they lift us off the face of the earth and drop us into this shitpile. She could probably derail a train, she could probably turn a train into a talking duck.
Agent Thomas Morgan: If you're staring at me, it better be because I'm the suspect. If not, get back to work or I swear you're all demoted to something that involves touching shit with your hands!
Zoe Perez: You don't have a choice. Look. Now, neither of us know if either of those brothers are guilty or innocent, so on behalf of the Secretary of the Air Force, I'm going into that room.
Agent Thomas Morgan: Well, on behalf of all that fucking bomb equipment in junior pinhead's apartment, no, you're not.
Answer: I think it was to show that Jerry and Rachel maintained a friendship after it all. Also to maybe, maybe hint about some kind of romantic future in the way that Rachel says, "you remembered", when her ex-husband was said to never have remembered Sam's birthday.That's my thoughts - I think it's just to let us know how the characters turned out.