I like the subtle "nerdy" references in this show. I just noticed a couple from episode 2 of season 5 within a few seconds of each other.
One of the guys Beverly is talking to uses the term "non-player characters." This is from Dungeons and Dragons (and role-playing games in general).
Later, the other guy in the room says if there are too many problems with a particular person, he or she will be "retired." (Blade Runner).
What are some other subtle "nerdy" references you've noticed?