This is the second episode of "The West Wing" to have a character named Tribbey - in the first season episode "He Shall From Time to Time", Tribbey was the name of the minister of agriculture who was picked to sit out the State of the Union.
The phone number Ainsley Hayes reads from her new phone, (202) 456-1414, really is a phone number at the White House. It's listed as an undisclosed number at a company called "The White House" located at 17th And PA Ave NW, Washington DC.
C.J.: ...in a half hour with President Bartlet and President Nimbala of the Republic of Equatorial Kuhndu who's representing the African nations.
Kuhndu is not a real country.
During the scene on Capitol Beat, host Mark Gottfried asks "why is this bill better than the Republican package the president vetoed?" But in the season 3 episode "Ways and Means", it is stated that the President has never vetoed a bill before!
In flashback, it is revealed that it was Toby who recruited C.J. to join the Bartlet campaign.
We learn in flashback, that Donna Moss joined the Bartlett campaign in New Hampshire as a volunteer after having broken up with her boyfriend, and that she had dropped out of the University of Wisconsin.
In the flashback with Josh and Bartlet at the airport, Josh says, "If you don't lose this election, it isn't gonna be because you don't try hard enough."
Some people think the "don't" is a goof. But in context, Josh is pointing out that by doing things like going to the airport instead of making his victory speech, Bartlet must be trying to LOSE the election. So if he doesn't lose, it won't be for lack of trying.
In one of the flashbacks, Josh uses a pay phone with a Verizon logo long before the Verizon brand name was created.
This episode has the most guest stars out of any episode of The West Wing.
There is a lot of discussion about the President not having signed a letter turning over power to the VP and so there was no one in charge. However the 25th Amendment provides for the VP and a majority of the principal officers of the executive branch (i.e. the Cabinet) to remove the power of the presidency from the President if he is unable to perform his duties. The VP would become the Acting President until the President submits a letter to Congress saying he is ready to reassume his duties.
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.
The title of this episode, "What Kind of Day Has It Been?" is also uttered by Leo in the episode "Commencement."
Goof: You clearly see a secret service agent grab CJ and push her down in one shot. As they cut away to the next shot, you see Sam taking her down, not the secret service agent.
CJ's fish bowl decoration: The Space Shuttle, (one of the subplots of the episode is a problem on the shuttle mission Toby's brother is on)
The departure of Mandy Hampton after this episode is never really explained.
Jed and Fitz discuss how the eagle in the great seal faces the arrows during times of war, which conflicts with Truman's 1945 Executive Order 9646 that the eagle must always face the olive branch.
The assassins load their guns while standing in the window frame, backlit by a bright red light; they are clearly visible from the street, and from other buildings, yet neither the agents on the ground, the sharpshooters on the roofs, nor the agents in the helicopter notice.
CJ's Fish bowl decoration is a telephone.
Goof: Since Mandy's memo is a work product of her contract with Russell, it would be owned by him, and therefore she could not legally show it to the Bartlet administration. (She could, however, create a new memo for them which said essentially the same thing.)
Goof: Sam says that he got the weather update from a Coast Guard First Lieutentant, but there is no such rank. The Coast Guard follows Navy ranks which would be either a Lieutenant or a Lieutenant Junior Grade.