Dude you have no idea, there are A LOT of nods to Alan Wake as well as documents describing the events and response of the FBC to lake incident as well as items like the coffee cups and even one of the manuscript pages.
Control legitimately continues the Alan Wake plot further than either DLC episode for AW or American Nightmare did - part of the reason I was pretty underwhelmed by them. I was expecting some sort of Easter egg in Control that tied the games together, but I was not expecting this game - and presumably the expansions - to act as something of an actual Alan Wake follow-up. Really cool.