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 Brilliance: Stephen Hawking recently mentioned that space affects time, and high-gravity areas slow time. He mentionedpyramids create gravity wells that slow time around them minutely (due to their density in location and build).
Hilarious in Hindsight: Teppic recalls that Ephebian gods sometimes turn into animals to win the favors of women, then finds Ptraci feeding a tortoise. Teppic "gave it a suspicious look, in case it was a god trying it on. It did not look like a god. If it was a god, it was putting on an incredibly good act." In a later Discworld novel, Small Gods, a god gets stuck in the form of a tortoise.
The whole "having to spend billions on making the pyramids" is suddenly much more funny, now that research has revealed that much of the labour done in Ancient Egypt wasn't actually done by slaves, but by actual workers.
Memetic Mutation: The confusion over P/Teppic's name is why Terry Pratchett was nicknamed Pterry.
Tear Jerker: The fact that Dios is in a Stable Time Loop. He's doomed to forever experience the same sequence of events over and over again, remembering and forgetting, only to realize at the last moment what has happened, and not be able to stop it...
Considering what Dios is like, though, that may not be such a horrible experience for him.