The custom 1971 Lincoln Continental Mark III used in the film was made by the legendary George Barris.

If you don't know who George Barris was he also designed the cars for the following shows.

The Munsters
Batman
Mannix
The Banana Splits Adventure Hour
The Beverly Hillbillies
The Bugaloos
Bearcats!
Banacek
Starsky and Hutch
The Dukes of Hazzard
Knight Rider