Frank Bullitt's car is a 1968 Ford Mustang 390 GT 2 2 Fastback.
First major film to use the word "bullshit."
Bullitt's reverse burnout during the chase actually wasn't in the script; Steve McQueen had mistakenly missed the turn. The footage was still kept, though.
Robert Vaughn has said on numerous occasions that his performance in this film is his best and contains the work he is most proud of.
Steve McQueen based his character on San Francisco Homicide Inspector Dave Toschi who is most notable for his work on the Zodiac killings.
Peter Yates called for speeds of about 75-80 mph, but the cars (including the ones containing the cameras) reached speeds of over 110 mph. Filming of the chase took three weeks, resulting in 9 minutes and 42 seconds of footage.
Bud Ekins, who did many of the Mustang stunts, also did the motorcycle jump for Steve McQueen in The Great Escape.
Both of the Dodges and one of the Mustangs were junked after the filming. The other Mustang was purchased by a Warner Brothers employee after the film was completed. A few years later, Steve McQueen attempted to buy it but the owner refused to sell, and the car now sits in a barn and has not been driven in many years.
Two Mustangs and two Dodge Chargers were used for the famous car chase.