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.
Anticlimax Boss: The Archchancellor's hat. It takes over the Grand Vizier and a big show is made of his ability to effortlessly annihilate even the sourcery-empowered wizards. He's engaging in open warfare with Coin... and then Carding essentially trips him (although that's only made possible because he was distracted by The Luggage in the first place), causing him to lose control of the magic he was using and annihilate himself. Considering how much effort went into stealing the hat, transporting the hat, recovering the hat, etc, you'd think that more time would go into stopping him when it's revealed that he's Knight Templar willing to end the rule of sourcery by force, even if it destroys the world in the process.
Inferred Holocaust: A huge number of implied fatalities, though there is debate as to whether the Reset Button covers these or not. One could say that a reason why the wizards change from amoral Vancians to magical Oxonians is that Coin/Ipslore killed all of the former.