Add to that, there are a couple of A-list cameos hidden in the season's opening episode, "USS Callister". So hidden, in fact, that it's pretty likely viewers won't have picked up on them on a first watch: Aaron Paul and Kirsten Dunst.
Paul's cameo is, at least, a little more prominent. With the episode led by Paul's Breaking Bad co-star Jesse Plemons, the actor dropped in to voice Gamer691, who harasses the AI crew of the "USS Callister" after they finally escape into the open internet.
In a fairly perfect representation of the stereotypical gamer troll, Paul's character demands: "Are we gonna blow each other or are we gonna trade?"
Dunst, who's engaged to Plemons and starred alongside him on Fargo, is a little harder to spot, meanwhile. She can briefly be seen in the background of the Callister offices in the real world, during the middle section of the episode.