Like many of Quentin Tarantino's recent films, Once Upon a Time In Hollywood shouldn't be considered a true story. If you attempt to reference it in your doctoral thesis about Hollywood in the 1960s, you will fail. But Tarantino's reimagining doesn't ignore real life completely; many of the people, places, and events in the film are based on real things that actually happened. They're just mixed in with so many made-up movies, character composites, and flame-throwing that it's tough to tell exactly what is real and what is fictional.
So, before you embarrass yourself by looking up Bounty Law episodes on YouTube, we've compiled a list of the parts that actually happened so you can loudly inform everyone around you while the movie's going on.