Dylan Minnette, AKA Clay Jensen, you may have seen on television before his lead role in the show! He was in the movie Goosebumps, and was Jerry Grant Jr. on Scandal!
Miles Heizer, AKA Justin Standall, played a kid on one of my favorite shows, Parenthood.
Kate Walsh, AKA Hannah's Mom, you've seen her as Addison Shepherd in Grey's Anatomy!
Steven Weber you've likely seen in iZombie or Spider Man as the Green Goblin.
Derek Luke, AKA Kevin Porter, you may have seen on Empire as Cookie's two second fling.
Amy Hargreaves, AKA Clay's Mom, you've probably seen on Homeland.
Keiko Agena, AKA Mrs. Bradley, is probably the one you've seen the most from Gilmore Girls!