Two Ferrari Daytonas were used (main car and a backup) The serial numbers were 14829 and 16467. Chassis 14829 was at the Peterson Automotive Museum until August 2013 and was once owned by Mel Blanc. Chassis 16467 also appeared in 'A Star in Born' (1976)
The character of Lapchick a shout out to silent film star, Charlie Chaplin. When ever he appears on screen, silent movie piano music plays, the character has no dialogue (save the final word in the film), the star who plays him, Harvey Jason, bears a resemblance to Chaplin, and if you scramble the letters in Lapchick, you can almost spell Chaplin.
The Playboy centerfolds on the walls of in the garage from where the race starts include: Liv Lindeland (January 1971), Heather Van Every (July 1971), Vicki Peters (April 1972), Francine Parks (February 1974), and Daina House (January 1976).