Charlie Sheen was high-school friends with Sean Penn and made 8mm movies with him, brother Emilio Estevez and Rob Lowe.
Harry Dean Stanton guest stars as one of Charlie's friends. He and Jon Cryer co-starred in "Pretty in Pink (1986)". Stanton played Molly Ringwald's father and Cryer played Ringwald's friend.
Charlie Sheen and Sean Penn had guest appearances in "Friends" (1994).
Guest star Harry Dean Stanton appeared with Charlie Sheen's brother, Emilio Estevez, in "Repo Man (1984)".