A future movie project about "made men" like the late mafioso Joey Gallo that Jon Favreau talks so passionately about in this episode is one he actually brought to some life in his 2001 film Made (2001). And fittingly, three The Sopranos (1999) cast members make cameos in that Favreau movie about would-be wiseguys: Vincent Pastore as "Jimmy?" Drea de Matteo as "Hot Girl 2" and Federico Castelluccio as "The Bouncer." Pastore, along with several others actors who eventually showed up in future "Sopranos" episodes, also appeared in the mob comedy Mickey Blue Eyes (1999). And in both this "D-Girl" episode and in Favreau's "Made" movie, characters make disparaging comments about "Mickey Blue Eyes."
When Christopher confronts Amy, it's in the offices of the twice-mentioned David DeCamillo. DeCamillo is a prominent talent agent, who happens to represent Janeane Garofalo, who appears in this episode playing herself.
This episode's 'D-Girl' title refers to a young woman in show biz who works to develop film or TV projects. And at one point in this story, Adriana asks Christopher if he had just spent time with John 'Izzicupo.' Perhaps it's only coincidental, but there is a real-life former Hollywood D-girl named Sunta Izzicupo who has produced six TV movies.
First of five episodes written by Todd A. Kessler, who like most 'Sopranos' staff writers, also produced or co-produced many other shows in series, a total of 20 in his case. His brother Glenn Kessler, also a TV writer/producer, did some acting as well, appearing in three 2001 episodes as an FBI technician.
Janeane Garofalo also co-starred in another TV episode entitled "D-Girl." That one was the March 13, 1997 episode of Law & Order (1990).