The 1961 Ferrari
250 GT California that starred in the cult classic Ferris Bueller's Day Off was really an MG in Maranello drag. In the movie Cameron states that less than 100 were made; actually only 55 were ever produced. The website www.80s.com pegs the value of an actual example at $2.5 million, which means thrashing and trashing one in the film would've busted the budget, along with drawing the ire of Ferrari faithful everywhere.
Instead, the film hired a company to build the car from an MG. That company, whose name wasn't mentioned in the article, was later sued by Ferrari for the use of its logo and later went bankrupt due to the amount of damages it was required to pay the prancing horse. We say blame it on Cameron's dad... it was his fault he didn't lock the garage.