Approval of God: Niki Lauda loves the movie, and has said he wishes James Hunt were still be alive so they could see it together.
Cast the Expert: A non-actor example - many of the cars featured in the film were actual Formula 1 cars from the period, driven by their current owners (many of whom race their cars in historic races.)
Fake Nationality: Chris Hemsworth is Australian and Olivia Wilde is American, they're both playing Brits. Also, Daniel Brühl is German but spent over a month in Vienna to get the Austrian accent right. Teddy Mayer is played by Canadian Colin Stinton. Italian Pierfrancesco Favino plays Swiss driver Clay Reggazoni, which has actually led some people to mistakenly think Clay himself was Italian (granted, he was born and raised in the Italian speaking region of Switzerland so completely understandable).