At the end of Josh's and Leo's scene when the wedding is about to start, the music heard is not "Sorge nel petto" as Will explains at the briefing, but "Lascia ch'io panga" - from Handel's 'Rinaldo' also, but a bit less appropriate (with words that translate as "Let me weep over my cruel fate, And that I long for freedom!") - unless the scriptwriter(s) had a gloomy view of marriage, that is.
Although credited, Alan Alda and Kristin Chenoweth do not appear in this episode. Dulé Hill & Richard Schiff also do not appear and are therfore uncredited.
President Bartlett: Russia and China are doing their little "Sharks and Jets" routine in Central Asia.
The Sharks and the Jets were the rival gangs in the movie West Side Story.