The storyline of the Guy's divorce was inspired by writer/creators Ben Sinclair (who also plays the Guy) and Katja Blichfeld's real-life marriage, which ended when Blichfeld came out as gay.
The Guy is reading Lincoln in the Bardo by George Saunders
Episode takes place on August 21, 2017, putting it 8 and half months after the season premiere which was on Nov 9, 2016. These two episodes are the rare ones that can be tied to an actual day.