Julianna Margulies (Alicia Florrick) & David Krumholtz (Josh Mariner) previously worked together on three episodes of ER (1994) as Carol Hathaway & Paul Sobriki respectively.
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.
Chris Noth (Peter Florrick) & Patricia Kilgarriff (Meredith Prady) also worked together on episode 3.19, Virus (1993), of Law & Order (1990), as Mike Logan & ? respectively.
Julianna Margulies (Alicia Florrick) & Michael Rispoli (Stu Harper) previously worked together on episode 4.22, A Hole in the Heart (1998), of ER (1994) as Carol Hathaway & Victor Nable respectively.
Chris Noth (Peter Florrick) & Lizbeth Mackay (Sandra) also worked together on episode 2.15, Trust (1992), of Law & Order (1990), as Mike Logan & Pamela Maser respectively.