When Chrichton is in "D. Logan's" office, he picks up a model of the Space Shuttle and says, "I reinact my initial mission. I show you how I create the giant blue twister that sucks me down to Oz."
In the same line as the Harvey reference, Crichton continues, "Or is it Clarence?" This is a reference to Clarence the angel whom Jimmy Stewart initially believes is a figment of his imagination in the Capra classic