A Bionorm warehouse employee refers to "O.P.P." for "Other People's Parts," in reference to the hit rap song "O.P.P." by Naughty By Nature, which had just entered "O.P.P." into the American English lexicon in the summer of 1991.
Harriet Sansom Harris had a recurring role as Frasier Crane's comically conniving agent Bebe Glazer on the TV show Frasier (1993).
Dennis Boutsikaris has played three different characters throughout the course of the series:
- Episode 1.4 Kiss the Girls and Make Them Die (1990) - Richard 'Dick' Berkley.
- Episode 3.4 The Corporate Veil (1992) - Richard 'Dick' Berkley.
- Episode 7.3 Good Girl (1996) - Al Archer.
- Episode 8.13 Castoff (1998) - Neil Pressman.
- Episode 11.8 Thin Ice (2000) - Al Archer.
- Episode 12.10 Prejudice (2001) - Al Archer.
- Episode 14.17 Hands Free (2004) - Al Archer.
Harriet Sansom Harris, who plays the FDA official, also played Sheila, the Irish barmaid, in The Troubles (1991).
Thom Sesma has played four different characters over the course of the series:
- Episode 3.4 The Corporate Veil (1992) - Dr. Blum.
- Episode 4.21 Doubles (1994) - Tom Boden.
- Episode 8.24 Monster (1998) - Mark Considine.
- Episode 14.1 Bodies (2003) - Detective Ed Goldstein.