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
Crichton calls the Scorpius in his head "Harvey," after the imaginary Pooka who accompanies Jimmy Stewart in the play and movie of the same name