I’ve never seen Paul Bartel‘s Cannonball (’76). It’s basically about the “Trans-America Grand Prix”, an illegal race held every year between Los Angeles (Santa Monica Pier) and New York City.
Wikipedia lists the following celebrity cameos: Joe Dante as “Kid”, Allan Arkush as “Panama”, Jonathan Kaplan as “All-Night Gas Station Attendant”, Roger Corman as “Los Angeles County District Attorney”, Don Simpson as “L.A. County Assistant District Attorney”, Martin Scorsese as “Mafioso #1” and Sylvester Stallone as “Mafioso #2.”