38th President: Gerald Ford, 1974
Movie = 38 (Ford was the 38th president)
Ford (cars) = Ford
Biker = 974 = 1974 became president
Jerry (cans) = Gerald
All the people watching the movie (38) at the drive-in cinema drove Ford (Ford) cars, which was strange seeing as the film was about a biker (974=1974).
Connect Ford to Gerald
On the back of all the Ford (Ford) cars were strapped Jerry (Gerald) cans because it was such a long way to the movies.
NOTE: The way Mammoth Memory remembers Gerald is to think Gerald the Jerry can.