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.
Genius Bonus: Several, especially when you know Arthurian lore. Also, one of the Livre V episodes is called Jizō, after a Japanese divinity who guards the souls of dead children. At the end of the episode Arthur is told that the daughter he knew he had didn't survive longer than a couple of weeks.