George Clooney really, really, really wanted to play J. D. (Source)

Thelma and Louise was the first screenplay Callie Khouri ever wrote. (Source)

Geena Davis decided to act out the sexy scene with J. D. because J. D. was Brad Pitt. We think that is a pretty good reason. (Source)

Many other actors were considered for the roles of Thelma and Louise before Susan Sarandon and Geena Davis got the parts. Others who were considered include Holly Hunter and Frances McDormand, Jodie Foster and Michelle Pfeiffer, and Meryl Streep and Goldie Hawn. (Source)