The "Rock The Vote" event shown at Cambridge, MA is aimed at encouraging young people to vote in the US general election. The band playing at the event, Barenaked Ladies, are all born and raised in Canada.
The opening line of President Bartlet's speech, "Joy cometh in the morning...", is from Psalms 30: 5: "For his anger endureth but a moment; in his favour is life: weeping may endure for a night, but joy cometh in the morning."
When President Bartlet (Martin Sheen) is giving his speech in East Lansing, the Flag of Mississippi is clearly visibile on the stage. East Lansing is in the State of Michigan, and the Flag of Michigan is not visible anywhere during the scene.
Bruno Gianelli says to Deborah Fiderer that she has a funny name. One source of the name is the French word feter, which means "celebrate" (as in having a fete). In other words, her name is "one who celebrates," which is an apt name for a character played by comedienne Lily Tomlin.