Kevin Bacon also played an FBI agent in Black Mass. Season 2, Episode 1 references the events depicted in that film.
Actors Seth Gilliam, Ernie Hudson, Dean Winters, Scott William Winters, Kathryn Erbe, Lee Tergesen, Craig Mums Grant, Tom Mardirosian and Philip Casnoff all stared in the hit HBO television series Oz. Both Oz and City on The Hill are produced by show runner Tom Fontana.
Sarah Shahi and Kevin Chapman starred together in Person of Interest.
There is a character introduced in season 1 episode 10 called Dana Barrett. Sigourney Weaver plays a character called Dana Barrett in Ghostbusters (1984) and it's two sequels Ghostbusters 2 (1989) and Ghostbusters: Afterlife (2021). Kevin Dunn, who appears in this series, also appeared in Ghostbusters 2 playing a contestant on Peter Venkman's talk show