Chris Noth (Peter Florrick) & Phyllis Somerville (Louise Nolfi) also worked together on two episodes of Law & Order (1990), as Mike Logan & Ms.Maltese/ Kristen Cameron respectively.
Julianna Margulies (Alicia Florrick) & Reg E. Cathey (Judge Aaron Coleman) previously worked together on episode 2.21, Take These Broken Wings (1996), of ER (1994) as Carol Hathaway & David Haskell respectively.