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.
Ho Yay: Some of the gentleman's interactions with Stephen could be interpreted as this.
Moral Event Horizon: Crossed by Lascelles when he shoots Drawlight. While Drawlight may not earn much sympathy, his murder is so cold-blooded and unexpected that you know Lascelles has gone off the deep end.
Older Than They Think: The story of John Uskglass has some resemblance to an English chapbook, The Merry Pranks of Robin Goodfellow. In the story, Robin (aka Puck) is a Half-Human Hybrid child of Oberon whose father grants him magical powers and gives the promise of eventually holding a kingdom in Faerie. Uskglass is admittedly human by birth, but was a foster-son of Oberon.
Purity Sue: Stephen Black checks a lot of the boxes, but there is some justification. He is fully aware that his social position in England, despite the genuine respect and affection he gets from Sir Walter and others, is still very precarious and so he must be on his best behavior at almost all times. Then, during the course of the story, he is most often seen in the company of the gentleman with thistle-down hair. The gentleman has more affection for Stephen than anyone else, but Stephen knows full well how changeable he is and that Stephen must be extremely careful around him. One misstep could easily result in his death.
The Woobie: Stephen Black. The Gentleman went looking for a woobie and ended up making one.
One of the footnotes gives us the story of the fairy called Buckler, who managed to lure several of the family members, servants, and neighbours of Simon Bloodworth into a magical cupboard from which they did not return. Two hundred years later Martin Pale is visiting a castle in Faerie and encounters a starved-looking little human girl.
”She said her name was Anne Bloodworth and she had been in Faerie, she thought, about two weeks. She had been given work to do washing a great pile of dirty pots. She said she had been washing them steadily since she arrived and when she was finished she would go home to see her parents and her sisters. She thought she would be finished in a day or two.”