These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Nightmare Fuel: The end of Lee Harvey Oswald's scene, when all the assassins surround him singing about how much they admire him while he loads his rifle and prepares to shoot Kennedy. The Lyrical Dissonance and the menacing sound of the melody make it especially creepy.
One-Scene Wonder: Depending on the direction, The Proprietor may pop up throughout the rest of the show, but he's only scripted for the opening scene, leading "Everybody's Got the Right". In the original production, Lee Harvey Oswald was this as well, though ever since the 2004 Broadway revival, it has become common practice to double him with The Balladeer.
Tear Jerker: "Something Just Broke", the one truly honest and heartbreaking song in the show, about the everyday aftermath of an assassination.
Booth's solo in "The Ballad of Booth" qualifies, as well.
The reprise of "Everybody's Got The Right" was one in the original production.
Czolgosz's portion of "The Gun Song," where he meditates on all the men who labored in factories or mines and were injured or killed just to make a simple object which in turn will be used to kill more people.