Jan-Michael Vincent told Howard Stern, days after filming and still seriously injured, that (he felt) this was one of his best performances.
Jan-Michael Vincent was in a serious car accident just before filming began and appears with a severely swollen and scarred face, still wearing his real hospital ID bracelet.
Jan-Michael Vincent, who had gotten in a car accident right before filming, had the facial injuries written into the script. When he's first shown in the garage, he points to his face and states that he doesn't want to have another attempt on his life, and that he's tired of going around looking "like Frankenstein."
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.