Michael Crichton sold the movie rights for $1 million before the novel was published.
Michael Crichton wrote the character Mark Lewyn for the film specifically with Dennis Miller in mind and the character in the book was somewhat modified for the screenplay to fit Miller's personality.
Milos Forman was originally attached to direct but left the film due to creative differences with Michael Crichton.
After Milos Forman left the project, Barry Levinson and Alan J. Pakula were in contention to take the helm.
Geena Davis was Michael Crichton's first choice for the female lead.
Annette Bening was originally set for the female lead until she fell pregnant. Madeleine Stowe was then considered before Barry Levinson settled on Demi Moore.