Right now my parents are watching the 1999 made-for-television docu-drama Come On, Get Happy: The Partridge Family Story. Now, we all know what kind of bus the real Partidge Family bus was;

http://www.imcdb.org/vehicle_136423-Chevrolet-6700-Series-1955.html

But in this movie, it was a 1960-66 GMC with the third and fourth headlights covered up.

http://www.6066gmcguy.org/Hood.htm

There are also some Winnebago Motor Homes, one of which was used by David Cassidy and his hippie friends to get high, a full-size 1973 Ford station wagon, in a scene two or three years before it was made, a 1967-72 Ford B-Series school bus, and a 1967 Chevrolet Biscayne police car.

No images from this, but the trivia and goofs are interesting, so what the hell.