The list Alicia supplies of possible killers, includes Phone Company, CIA, Mossad, Zodiac Killer and Steve Jobs.
Julianna Margulies (Alicia Florrick) & John Cullum (Cardinal James) previously worked together on 15 episodes of ER (1994) as Carol Hathaway & David Greene respectively.
Chris Noth (Peter Florrick) & P.J. Benjamin (Old Captain) also worked together on episode 5.10, House Counsel (1995), as Mike Logan & Arthur Gibbons respectively.
Alan Cumming (Eli Gold) & Gene Gillette (Sean Nozowitz) also worked together on episode 1.11, Blast from the Past (2018), as Dr. Dylan Reinhart & "Motorcycle Man" respectively.