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.
Fridge Horror: Cutangle is never seen or mentioned again after this book but given the Klingon Promotion nature of the position of Archchancellor he was almost certainly murdered shortly after the events of the story.
Cleaning the wizards' lavatory, Esk briefly stands between two mirrors, and glimpses one of the receding infinity of her own reflections waving to her. Cute, right? Now go read the other witch novels, and consider what happened to Lilith...
Hey, It's That Voice! (the typeface version): At one point the Things from the Dungeon Dimensions speak in the same block capitals as Death, which can be a bit disconcerting to the reader used to later Discworld books.