His win was met with protests immediately as some angry fans outside the venue held up signs demanding justice and more than a handful of celebrities at the ceremony got up and walked out.
Chinatown is one of if not the greatest detective movies ever made, and it's understandable why and how it influenced many films after.
The filmmaker will appear in the film as the husband to Margot Robbie's Sharon Tate in the midst of the Manson Family murders.