The car Mary Steenburgen drives was popularized by the band ZZ Top in music videos. The car Will Forte and Kristen Schaal drive is the DeLorean from Back to the Future (1985). Both Steenburgen and ZZ Top appear in Back to the Future Part III (1990).
In season 1, episode 12, Phil Miller claims he has no middle name, so the main character also named Phil Miller then goes by his middle name, Tandy. In this episode it is revealed on the license displayed on the grave of Phil Miller, that his middle name was Stacy.