The scenes for the Albany train station were filmed at the Yonkers, NY train station.
Gerry Bamman has played four different roles over the course of the series:
- Episode 1.22 The Blue Wall (1991) - Internal Affairs Lieutenant Kennedy.
- Episode 5.11 Guardian (1995) - Dean Pollard.
- Episode 7.2 I.D. (1996) - Defence Attorney Stan Gillum.
- Episode 8.20 Burden (1998) - Defence Attorney Stan Gillum.
- Episode 10.13 Panic (2000) - Defence Attorney Stan Gillum.
- Episode 11.17 Ego (2001) - Defence Attorney Stan Gillum.
- Episode 14.12 Gaijin (2004) - Judge Thomas Everton.
- Episode 16.11 Bible Story (2005) - Judge Thomas Everton.
This episode was based on the true life case of Thomas Capano, a millionaire property developer, criminal lawyer and Delaware attorney general who was disbarred after being convicted of the 1996 murder of his longtime mistress Anne Marie Fahey. He received the death penalty but this was eventually commuted to life without parole. He died in 2011 in his cell at the age of 61 of a heart attack.
Nancy Ticotin portrayed four different characters over the course of the series:
- Episode 3.15 Mother Love (1993) - Miss Gomez.
- Episode 7.5 Corruption (1996) - Club Bahia Hostess.
- Episode 11.8 Thin Ice (2000) - Alma Nogales.
- Episode 11.14 A Losing Season (2001) - Detective Reina Perez.
- Episode 11.15 Swept Away - A Very Special Episode (2001) - Detective Reina Perez.
- Episode 11.17 Ego (2001) - Detective Reina Perez.
- Episode 11.20 All My Children (2001) - Detective Reina Perez.
- Episode 11.22 School Daze (2001) - Detective Reina Perez.
- Episode 11.24 Deep Vote (2001) - Detective Reina Perez.
During the interview with the convict, Detective Lennie Briscoe cracks, "Women - can't live with 'em, can't kill 'em". This is a paraphrase of a one-liner made by comedian Steven Wright on his 1985 album 'I Have a Pony' (Wright says "shoot", not "kill"). Comedian 'Emo Phillips' makes a similar comment ("Women - can't live with 'em, can't get 'em to dress up in skimpy little Nazi outfits") on his album "E=MO Squared", also released in 1985.