This Boogie Nights proved to be a watershed event for a good many talented actors. Marky Wahlberg, Thomas Jane, John C Reilly, Don Cheadle, Julianne Moore, Phillip Seymour Hoffman, and Melora Walters were all in this movie and most have gone onto a great deal of success. This work was good to the older actors also. Phillip Baker Hall's performance as Floyd Gondolli certainly got him more character actor work and Burt Reynolds certainly showed that he was still a force in the acting game. Can't forget William Macy whose work as Little Bill was epic, and the performance from Robert Ridgely (RIP) was a home run for his final work.
I would also be remiss to not include Alfred Molina as Rahad Jackson. His manic performance is something to see. Joanna Gleason, Heather Graham, Nicole Ari Parker, Luis Guzman, and Robert Downey Sr. also had roles. I am sure I am forgetting a few notables.
Boogie Nights is a movie based on the "Golden Age" of the adult film genre in the late 70's and early 80's. There was one actual "adult film" actor from that era (represented by Veronica Hart), and later eras (including Skye Blue, Lil Cinderella, Tony Tedeschi, Summer Cummings, Lexi Leigh, and the well known Nina Hartley), who had roles in this mainstream hit.
It is a rather fun film to watch. Oh. The entrances? Check it out.