Denis O'Hare who plays Father Chris Shea here also played a character named Father Shea in an 2008 episode of Law & Order: Criminal Intent called "Last Rites."
Peter Gerety who plays Judge Harrison also portrayed Judge Daniel Phelan on HBO's The Wire.
In the scene where they are discussing Father Shea's background, Det. Amaro mentions in passing that Father Shea was a prison chaplain. This is a reference to Last Rites (2008) in which his character, Father Shea, also appears.
Denis O'Hare has had two different roles over the course of the series: *Episode 1.16 The Third Guy (2000) - Jimmy Walp *Episode 14.10 Presumed Guilty (2013) - Father Chris Shea
Both Erik LaRay Harvey (Sam Randall) and Theo Rossi (Enrique Rodriguez) were on the series Luke Cage.