The last episode of the first season of all three of Aaron Sorkin's TV shows (The West Wing (1999), Sports Night (1998), and Studio 60 on the Sunset Strip (2006), as well as the series finale of The Newsroom (2012) is entitled "What Kind of Day Has It Been?"
During the taping of the final scene, Jorja Fox's foot was run over by one of the limousines. She continued working on the scene until Aaron Sorkin was informed by the driver of the car that her foot had been run over. She was taken to the hospital and treated for a broken foot before returning to work. According to Sorkin, Fox apologized and said that it was her fault for missing her mark.
In this episode Charlie tells Josh 'you're right, it doesn't go away'. This is not explained in the episode. It references episode 3, the one where they first hire Charlie. At the end of that episode, Charlie tells Josh (as the President is about to address the nation) 'I've never felt like this before'. Josh replies 'It doesn't go away'. The statement by Charlie in this episode is a direct reply to this.
Martin Sheen is seen drinking out of a University of Dayton Flyers coffee mug. Sheen grew up in Dayton, Ohio. He has said that he failed his entrance exam there so he could pursue acting. He likes to give shout outs to his hometown from time to time.
CJ (Allison Janney)'s fish bowl decoration: The Space Shuttle, (one of the subplots of the episode is a problem on the shuttle mission Toby (Richard Schiff)'s brother is on).