Well, 'Once Upon a Time in Hollywood' is a story that weaves together different threads. It's not just about the two main characters, Rick and Cliff. It also gives a sense of the overall Hollywood atmosphere in 1969. There are parties, movie sets, and encounters with various people in the industry. It plays with the idea of how Hollywood can both build and break a person. The movie also has some interesting sub - plots related to the Manson Family and how the main characters' lives are unknowingly on a collision course with the dark events associated with that group.
It's about a fading actor and his stunt double in Hollywood in 1969. There are elements of their daily lives, their friendship, and how they intersect with the changing Hollywood scene at that time. Also, it has some fictionalized takes on real - world events that happened in Hollywood during that era.