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.
It Was His Sled: If you can some how manage to hear anything about this book without seeing the phrase "THAT! IS!! NOT!!! MY!!!! COW!!!!!", you are very lucky.
True Art Is Incomprehensible: There are two "modern art" pieces by Daniellarina Pouter: Don't Talk to Me About Mondays, which consists of a pile of rags, and Freedom, which consists of a stake to which Ms. Pouter had been nailed after Lord Vetinari had seen her previous piece. (She was delighted and is planning to nail herself to a wide variety of objects in the near future as a special exhibition.)
Despite that, Nobby's suggestion that the empty frame where The Battle Of Koom Valley had been before it was stolen be reclassified as a piece of modern art named Art Theft was rejected.
The Woobie: You can't help but feel sorry for Brick after a while. Maybe even instantly. Helmclever as well.