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.
Big Lipped Alligator Moment: This book is sometimes considered one with respect to the Discworld series, given its short length, different publisher, unusual themes (more at home in Good Omens in some ways) and the fact that the events therein are never referred to again (except for a Continuity Nod in The Last Continent when Rincewind mentions in passing that he's met the Creator).