Matt Czuchry (Cary Agos) & Sterling K. Brown (Andrew Boylan) previously worked together on episode 2.2, Hidden Agenda (2003), of Hack (2002).
Julianna Margulies (Alicia Florrick) & Wayne Duvall (Detective Harcourt) previously worked together on episode 1.23, Love Among the Ruins (1995), of ER (1994) as Carol Hathaway & an umpire respectively.
Chris Noth (Peter Florrick) & John Cunningham (Gene Osterman) also worked together on three episodes of Law & Order (1990) as Mike Logan & various characters respectively.