I knew quite a lot about the historical events the film is based on from watching an E! True Hollywood Story on Roman Polanski many years ago, and even when the movie “went off to the rails” from the true story, I was far too bored to care.
Side note on Roman Polanski: undoubtedly great filmmaker, he can go fuck himself as a human being and those who stand by him should be ashamed of themselves. Learn to separate the art from the artist.