This episode introduces the character of R.D., played by Oliver Platt. He appears in 3 episodes in total.
Julianna Margulies (Alicia Florrick) & David Krumholtz (Josh Mariner) previously worked together on three episodes of ER (1994) as Carol Hathaway & Paul Sobriki respectively.
Doris McCarthy, who appeared in four episodes as a variety of characters, also had an uncredited role playing the part of a local dignitary in episode 1.7 of The Good Wife spin-off, The Good Fight (2017).
Chris Noth (Peter Florrick) & David Krumholtz (Josh Mariner) also worked together on episode 4.1, Sweeps (1993), of Law & Order (1990), as Mike Logan & Scotty Fisher respectively.