I Was an Extra On This Movie
Along with hundreds of others!
They shot the crash scene at the fontana speedway (when it still existed) and gave away tickets to be in the grandstands for it. They also had some drag cars and a jet dragster doing things on the track.
I was a kid then and it was pretty exciting. I remember having to hold my ears when the jet dragster went by. I also remember the director, directing the crowd, "Okay now!" and everyone turned like they were watching the race and then reacting to the "crash"
I got Shirley Muldowney to sign my ticket stub and I still have it!