I thought it might be nice to have a thread listing out little parallels, details, and insights Dresden never calls out explicitly in the series. Apologies if one already exists. There are a few I like, Butter's comment about getting a lightsaber is a classic, but I thought I'd start it off with one I'm not sure many others have caught or brought up:
In Turn Coat, Dresden talks about how the wardens are being spotted all over the country looking for Morgan. He concludes it's a wild goose chase, but he's not sure why the wardens would be showing up in these random cities.
The Summer Court's anti-tracking measure for Morgan is a deliberate nod to what Dresden did to their tracking spells in Small Favor, sending them bounding around the city via Little Chicago. Eldest Gruff even asks how he did it. Clearly, they figured out something along the same lines.
What are some of your favorite details and nods to past events?