It particularly does justice to our imagined/cinematic/nostalgic view of Hollywood and its environs circa the early 50s.
Michael Marius Pessah, has done an ace job of it. The darks and lights; the shades of grey; the rich, almost blacks will make most cinephiles' mouths water.
James Preston, above and below -- whose face does indeed resemble the late actor in enough ways to make the movie work. And he's drawn a decent performance from Preston, too, in which the actor "holds back" in the same way Dean did, thus making himself interesting on a cinematic level and more desirable on a personal one. (Anthony Perkins had this same quality, early in his career; Ryan Gosling has a little of it, which he is quickly losing: too much Nicolas Winding Refn? Probably.)
Dan Glenn, below), who is never identified with a name, but is clearly here seen as one of the important friends and loves of Dean's short life.
A Portrait of James Dean: Joshua Tree, 1951 -- from Wolfe Video -- is available now via Netflix streaming & elsewhere.