Julianna Margulies (Alicia Florrick) & Ron Rifkin (Spencer Randolph ) previously worked together on ER (1994) as Carol Hathaway & Dr Carl Vucelich respectively.
John Procaccino reprises his role of Judge Tom Glatt in The Good Wife spin-off, The Good Fight (2017).
Chris Noth (Peter Florrick) & Michael Gaston (Ernie Nolan) also worked together on episode 4.22, Old Friends (1994), of Law & Order (1990), as Mike Logan & Wheeler respectively.