How would I go putting a copyrighted logo on my car?

There are several different Jurassic Park vehicles, but it really does not matter so much which you are trying to emulate. First, it is questionable whether these vehicles possess the degree of subject matter that is required to qualify for copyright protection, beyond the image of the dinosaur on the park logo. However, since you are copying it, to the extent that copyright protection exists, you would be violating the copyright by duplicating the decorative aspects of the Jurassic Park vehicle without the consent of the copyright owner. Also, the copyright notice need not be placed on a work for it to be protected by copyright law.  Equally important, and not mentioned by you, is issues relating to trademark protection.  You do not mention what you intend to do with the vehicle. The Jurassic Park name and logo are registered trademarks for numerous goods and services so that virtually any unlicensed commercial use of the name and/or logo would subject you to litigation by the trademark owner.  As for eliminating the "s" such a trivial modification would have no effect on your liability.