The car featured in the film is a 1970 Dodge Challenger R/T, with a 440 cubic-inch V-8, and not a 426 Hemi V-8 (as is often believed). Eight white Challengers loaned from the Chrysler Corporation were used during the filming.
There were actually four 440 Challenger R/Ts and one 383 Challenger R/T, which was an automatic with green interior. This one was used for some exterior shots and it pulled the 1967 Camaro up to speed so the Camaro could hit the bulldozers. As confirmed by property master Dennis J. Parrish, all of the cars were NOT originally white. They were just painted white for the film. During the scene where Kowalski has a flat tire, you can see green paint in the dents.
Charlotte Rampling had a role as a hitchhiker whom Kowalski met while en route, but her scenes were deleted before the US release. The scenes were re-inserted for the UK release. The DVD release includes both the US and UK versions.
When Kowalski changes the tire in the desert, he's shown tightening the lug nuts in a counterclockwise direction. This is because during the 1960's-1970's, Chrysler Corp. used reverse threaded studs and nuts on the left side of their cars. The idea was that the rotation of the wheel would help keep the nuts tight. When this theory was debunked, they switched to standard threads all around.
It is stated in trivia above that "Jim" is the character's first name because "Jake" his drug dealer calls him "Jim". This is incorrect. African-Americans often called white males "Jim" during the 1970's. In the 1978 film "Superman" in the scene where Kent changes to Superman, the African-American pimp says,"Say, Jim, whoo!" And in Live and Let Die when the black taxi driver "captures" James Bond and, without knowing his name, says, "well hello, Jim!"
British rock band Primal Scream released their 1997 'Vanishing Point' album, which features several dialogs sampled directly from the movie and was reportedly conceived as "an alternate soundtrack to the movie".
When Sandy (Kowalski's supervisor) is being interviewed by the media, various bikers are seen. Sarafian states that they moved from location to location in tandem with the crew. Even partying together with the crew. Sarafian is visible in the scene as the dark haired man in a beige ten gallon hat.
According to Sarafian on the commentary, he made the film on a budget of 1.3 million. Sarafian also admitted that he had surpassed the allotted budget by $80k due to execute producer Richard Zanuck taking a like for the film. Zanuck then hired eight different teams of Dolby artists to bring a visceral aesthetic to the Challenger. In the end, Sarafian lost 2.5 points which he joked were "Vanishing Points!"