Actually, that era of film/hollywood is really interesting-bizarre to look into, so I got it. I knew about some of them stories. Current hollywood parties really cant compare, really. The fatman in the opening was based on a real life death. Most of them actors and directors went the way of disposable sewage with talkies. Them studio owners had back doors/alley ways on the lots for their private meetings with the starlets and so many on site crew deaths. Chazelle just took that premise and made it a heavy cocktail that lasted about 3 hours and it was awful.
There is a doc, which is sadly only available on vhs last time I ran into it. Doc is about interviewing all them stars from that era and how they were living, it took place in the late 70s-early 80s, real tragic for the most part, but oddly fascinating.