Continuity mistake: When Gage, David, Diana, and Gage's Assistant are meeting in the room, right before Diana and Gage go off for their "agreement", Gage enters the room and is buttoning the right side of the jacket down by his pants, then in a following shot, he is buttoning the same coat button.
Indecent Proposal (1993)
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Directed by: Adrian Lyne
Starring: Woody Harrelson, Robert Redford, Demi Moore, Seymour Cassel
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Diana: The dress is for sale. I'm not.