The title of this episode is a play on the pilot episode, "Back Issues". The closing music is also the same music played during the closing moments of the pilot when Maya and Jack are staring at baby Hannah in the hospital.
For the first and only time, we see what is behind Finch's desk: a trap door leading into Jack's cabinet. A few seasons earlier, when Finch's father visited, Jack escaped his office through a secret door--but Finch didn't know where it was. Now, Finch appears to have always known where it was.
(Elliot and Maya lay on a bed, thinking about Jack's retirement)
Elliot: You get horny when you're sad?
Maya: (awkwardly) ...No
Elliot: Yeah, me neither.
Jack: We made a great team, huh? My life, I've had a hell of a ride. But I wouldn't trade the time we had together for anything.
(Jack embraces Elliot, Nina then Finch. They exit the office. Maya walks up to Jack)
Maya: You okay?
Jack: It's all good.
(Maya exits. Jack pauses, then follows her out)
Jack: And you know what I'll always love most about you?
Nina: My ass? Most people say it's my ass.
Maya: Someone take a pillow and smother me.
Finch: Why don't we use your boobs?
Nina: When I needed a job, you were there. When I needed a friend, you were there. When I needed a kidney, you were there.
Finch: Yeah, I think that was my kidney.
Nina: Yeah, but Jack made you do it, and that's what's so sweet.