While testifying Detective Lennie Briscoe states that he doubted the victim earned $2,000 in a single night working as a prostitute, he then jokingly says "it's not like she worked for Heidi Fleiss." Heidi Fleiss is a former madam that ran a high-end prostitution ring based out of Los Angeles, California during the 1990's. She catered to the famous and wealthy and such she became known as the "Hollywood Madam."
Michael McCormick has played four different roles over the course of the series:
- Episode 6.7 Humiliation (1995) - Marty Gerber.
- Episode 9.2 DWB (1998) - Dietrick's Attorney.
- Episode 12.23 Oxymoron (2002) - Nicky Avakian's Attorney.
- Episode 19.7 Zero (2008) - Judge Mark Brannigan.
Rosa Arredondo has played four different roles over the course of the series:
- Episode 6.7 Humiliation (1995) - Nina.
- Episode 9.10 Hate (1999) - Cecilia (as Rosa Evangelina Arredondo).
- Episode 12.12 Undercovered (2002) - Mrs. Garcia.
- Episode 19.18 Promote This! (2009) - Juanita Stratton.
Patrick Boll has played four different roles over the course of the series:
- Episode 4.15 Kids (1994) - Newsman.
- Episode 6.7 Humiliation (1995) - Rick Sidney.
- Episode 17.7 In Vino Veritas (2006) - Barry Bishop.
- Episode 18.10 Tango (2008) - Allan Liscomb.