Before Daniel Shelly joined The Metropolitan Opera Orchestra as a bassoon player in 2004, he had a one-line part in this episode of Law & Order. His web page for The Metropolitan Opera Orchestra Committee notes that after this role "failed to garner him an Emmy nomination, Mr. Shelly turned his back on television and joined the Metropolitan Opera Orchestra instead."
Jan Maxwell has played four different roles over the course of the series:
- Episode 5.1 Second Opinion (1994) - Dr. Nancy Haas.
- Episode 8.2 Denial (1997) - Mrs. Sarah Talbert.
- Episode 11.3 Dissonance (2000) - Marian Reger.
- Episode 14.7 Floater (2003) - Judge Ruth Alexander.
Ronald Guttman portrayed three different characters over the course of the series:
- Episode 1.6 Everybody's Favorite Bagman (1990) - Farber.
- Episode 10.8 Blood Money (1999) - Assistant Italian Consul.
- Episode 11.3 Dissonance (2000) - Carl Reger.
Stephen Singer has played sic different characters over the course of the series:
- Episode 2.9 Renunciation (1991) - Aaron Gerstein.
- Episode 5.17 Act of God (1995) - David Pence.
- Episode 8.14 Grief (1998) - Defense Attorney Baum.
- Episode 11.3 Dissonance (2000) - Rafael Kessler.
- Episode 15.7 Gov Love (2004) - Larry Levine.
- Episode 19.16 Take-Out (2009) - Nathan Vick.
Andrew Polk has played five different roles over the course of the series:
- Episode 7.19 Double Down (1997) - CSU Technician.
- Episode 11.3 Dissonance (2000) - Stuart.
- Episode 13.12 Under God (2003) - Jared Sterling.
- Episode 18.16 Strike (2008) - Bank Manager.
- Episode 20.18 Brazil (2010) - Eli Driscoll.