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.
But "What's the point of a revolution—without general...general copulation, copulation copulation!" deserves a spot all of its own.
Ear Worm: The songs can be quite catchy. Scary and catchy, though.
Fridge Brilliance: Perhaps not intended, but Marat was assassinated in his bathtub, and the play takes place in the bath-house of the asylum.
Values Dissonance: The whole play is about setting these up, and letting the opposites tear each other apart.
Vindicated by History: One of the many issues raised during the play is the nature of Marat (and de Sade's) life-work, and wondering how History will judge them for what they did. Again, de Sade is using Marat as a way of explaining himself.