- The helmet design that James Garner's character uses is that of then-Grand Prix race driver Chris Amon. The only difference was a silhouette of a Kiwi bird that was normally on the side of Amon's helmet (he was from New Zealand) that was left off of Garner's, as his character was an American.
- The helmet design used by Brian Bedford is that of then second-year driver and future triple World Champion Jackie Stewart. Of the four actors, Bedford is the only one not to do any actual driving, which explains why in all segments where the Scott Stoddard character is shown driving, he has the balaclava up to his goggles.
- The cars that were used in the film, supposedly Formula 1 cars, were in fact Formula 3 cars made up to look like Formula 1's.
- During filming, Yves Montand spun out and subsequently was terrified to go fast again. The crew then modified a racecar that was then towed behind a Ford GT40. This set up would reach speeds of 130. Montand was more comfortable with this set up, then having to drive the car himself.
- Frankenheimer refused to film cars moving slowly, then speed the film up. He felt the average moviegoer would be able to notice the difference.
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