Toby is seen skyping his brother Rory from his office. The actor is Warren Lieberstein, Paul Lieberstein's real brother. In real life, Warren was married to Angela Kinsey.
During the scene at the airport where Michael talks to the camera for the last time, he takes off his mic and says "This is gonna feel so good getting this thing off my chest". Afterwards, the audio cuts out and, if you look and listen very closely, Michael says to the cameraman "That's what she said".
The scene where we see Michael through the shades of his office window placing his trophy onto his desk and then straightening it out, mimics the clip from the opening credits where he does the exact same thing, used since season 1. It's one of the few clips that have stayed in the opening credits throughout the years of changes.
Steve Carell's eyes were red the entire episode most likely from crying in all of his final scenes.
When Gabe is talking to Erin in the women's restroom, Creed walks out of a stall behind them. This references a scene from Women's Appreciation (2007), during which he says he likes to use the women's bathroom for number 2.