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.
Accidental Innuendo: Lampshaded; when the photographer talks about taking some photos of a raging orgy, he says he "shot his roll and left". Harry has to try hard not to laugh.
Hilarious in Hindsight: Harry's offhand comment about how he'd never dare summon and trap Santa Claus in a magic circle and he doesn't know anyone with the balls to try it becomes much funnier in the context of Dead Beat (in which he manages to summon and trap the Erlking in a magic circle) and Cold Days (which confirms that Santa and the Erlking are pretty much equal in terms of power).
Squick: This is Harry's reaction to the person who gives him some CPR.