Debi Mazar, who has a recurring guest star role as Shauna in season 1, is promoted to opening credits billing in season 2.Her appearances in season 3 were limited due to her pregnancy and Mazar made her final regular appearance in episode 42 (season 3 finale).Mazar made appearances in seasons 4 through 8 and is credited as a special guest star.Melissa Gold (Perrey Reeves) and Lloyd (Rex Lee) have recurring roles in the first two seasons.
20 proved to be major years for Jamie-Lynn – continued work on “The Sopranos,” a role in the film “Extreme Dating,” and the lead in “Beauty and the Beast” on Broadway. Following “The Sopranos,” Jamie-Lynn appeared in “New York Serenade” and the mini-series “The Gathering.” She released an autobiography at the age of 21 in 2002 entitled “Wise Girl: What I’ve Learned About Life, Love, and Loss.” Tired of striking out?
In season 4, Rhys Coiro, who portrays recurring character Billy Walsh, is credited as "starring" in the end credits for the first six episodes of the season.
However, when his character returns in episode 52 (season 4, episode 10), he is again credited as a guest star; he returns in season 7 as a recurring special guest star and is credited as "starring" in the end credits again in season 8.
Starting in season 3, Reeves and Lee are credited as "starring" in the end credits in the episodes they appear in.
Reeves receives opening credits billing starting with season 4, and Lee is added to the opening credits starting with season 5.