I remember hearing Horner say that his job on JP 1 was mostly getting the actors to pronounce the names correctly.
Please remember: Jurassic Park is a movie. Horner is an advisor; he is not the Director. Directors and producers are free to ignore each and every piece of advice they are given.
Furthermore, Jack Horner's area of expertise is hadrosaurs. Although he knows more about theropods then basically anyone else involved in the production, they are not his research speciality.
Similarly, when reading ANY press releases related to the JP series, take any scientific assertion with a major chunk of halite (i.e., a big grain of salt...).
Thomas R. Holtz, Jr. Vertebrate Paleontologist Department of Geology Director, Earth, Life & Time Program University of Maryland College Park Scholars College Park, MD 20742 <http://www.geol.umd.edu/~tholtz/tholtz.htm>http://www.geol.umd.edu/~tholtz/tholtz.htm http://www.geol.umd.edu/~jmerck/eltsite Phone: 301-405-4084 Email: tholtz@geol.umd.edu Fax (Geol): 301-314-9661 Fax (CPS-ELT): 301-405-0796