The title and basis for this episode, alienation of affection, were indeed legal in Illinois when this episode premiered. However, four years later Illinois no longer recognized as a legal complaint.
Carrie Preston reprises her role of Elsbeth Tascioni in The Good Wife spin-off, The Good Fight (2017).
Alan Cumming (Eli Gold) & Chris Henry Coffey (Jake Huntley) also worked together on episode 1.3, Secrets and Lies (2018), of Instinct (2018) as Dr. Dylan Reinhart & Todd respectively.
F. Murray Abraham reprises his role of Burt Preston in The Good Wife spin-off, The Good Fight (2017).
Lionel Deerfield, played by Edward Herrmann, previously appeared in episode 2.4, Cleaning House (2010).