You can't put Richard Feynman in a movie about someone else unless you're very cautious, because he's such a large persona that he would take over and the film would lose focus.
I love that "Oppenheimer" simply has an unnamed guy playing the bongos in two or three scenes at Los Alamos, and now I learned that the "[the windshield will protect me from the UV]" guy is also Feynman.
I wonder how many little details like this I would catch if I read up about the project and the people around it for two weeks and then watched it again.