When Dorr is explaining their goings on in the basement, he says they hit a pocket of natural gas (which explains the explosions), knowing what it was by the smell of "rotten eggs". It is a known fact that natural gas has no smell naturally, but is in fact given it by the gas company so leaks can be noticed before they reach lethal levels.
Professor Dorr's orchestra "performs" both Renaissance and Rococo music. (The pivotal Luigi Boccherini recording is from the latter.) Although Dorr uses the terms interchangeably, the two styles are completely different, and separated by a span of about 150 years.