Jan-Michael Vincent told Howard Stern, days after filming and still seriously injured, that (he felt) this was one of his best performances.
The vehicle used by Chad McQueen is a replica of the 1968 Ford Mustang Fastback his father (Steve McQueen) drove in "Bullitt".
A 1977 Cadillac Coupe DeVille was used to destroy a Porsche 911 when stealing the Corvette containing the contraband.
Shortly after Jimmy enters the vehicle impound parking facility he passes a white Ford Bronco with caution tape (used at crime scenes, accidents, etc.) draped over the rear of it. This is an obvious reference to the vehicle in which O.J. Simpson was riding during his infamous slow-speed chase with police.
Chuck Zito refused to do a scene in which his character urinates in his pants when a gun is pointed to his head.