I have always been of the opinion that the Velociraptors in the Jurassic park films were not Velociraptor mongoliensis (6 ft long), or Utahraptor ostrommaysorum (23 ft long), but were actually Deinonychus antirrhopus (11 ft long). Deinonychus antirrhopus was basically a larger North American cousin of the Asian Velociraptor mongoliensis. In Predatory Dinosaurs of the World (a book I have read), Gregory S. Paul argued that Deinonychus should be grouped in the genus Velociraptor.
There is a Smithsonian.com article from 2008 that talks about this, and says that Michael Crichton read Paul's book and was influenced by it:
You say “Velociraptor,” I say “Deinonychus”