Watched the trailer for Rush a while back, and in the "Related" Youtube links, I found an excellent BBC documentary on the Hunt-Lauda competition for the 1976 Formula 1 World Championship:
Clash Of The Titans - Lauda Vs Hunt
James Hunt: Clash Of The Titans - Lauda Vs Hunt - YouTube
And "related" to that
Barry Sheene & James Hunt - When playboys ruled the world
Barry Sheene & James Hunt - When playboys ruled the world - YouTube
Interesting look at celebrity of sports stars then and now, focusing on James Hunt, and motorcycle racing champ Barry Sheene.
I am glad I don't know how many hours I have spent thanks to YouTube "Related" videos.