John Ventimiglia has played four different roles over the course of the series:
- Episode 20.19 Crashers (2010) - Attorney Dibbens
- Episode 19.15 Bailout (2009) - Attorney Dibbens
- Episode 9.2 DWB (1998) - Officer Frank Dietrick
- Episode 6.1 Bitter Fruit (1995) - Nick Capetti
- Episode 5.4 Family Values (1994) - Gaydos
Michael Gaston has played five different roles over the course of the series:
- Episode 19.15 Bailout (2009) - Pete Gardner
- Episode 11.18 White Lie (2001) - Major Jim Wyman
- Episode 9.16 Harm (1999) - Mr. Delany
- Episode 7.9 Entrapment (1997) - Ron Fletcher
- Episode 4.22 Old Friends (1994) - Wheeler