... included such scientific luminaries as Geri Halliwell of the Spice Girls (not just once, but twice!), Drs Burns, Honeycutt and Pierce, all of whom were fictional characters on MASH, Michael J Fox (the real actor), Perry Mason (the fictional lawyer), Charles Darwin and at least one character from Star Wars.
Those names were discovered and removed. You would know that if you read the article properly.
Don't use the Wikipedia article, go directly to the website of the Oregon Project.
Global Warming Petition Project
Take a look at the FAQ section. There is detail there about fraudulent signatures and other attempts to discredit the petition and how that was dealt with. Amongst other things, it points out that names such as Perry Mason, Michael Fox are not the actors, but real scientists that have the same names.