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.
Magnificent Bastard: In addition to Vetinari, who's always one, William shows signs of becoming one, particularly in any scene where he has to deal with threats to the press, such as his handling of Slant.
Nightmare Fuel: The book describes images resulting from dark light photography in very vivid detail. Then near the end, where one of the photos comes true...