The documentary's protagonist, Ken Close, tested for admittance into Mensa two months prior to the start of principal photography. He felt his Mensa membership was needed to add credence to the project. Had he failed to score high enough (top 2%) on the I.Q. test to qualify for Mensa membership, the documentary would have been cancelled.
In the University of Michigan study cited in the documentary, a clip from "The Bridges Of Madison County" raised women's progesterone levels by up to 10%. A clip from "The Godfather II" raised men's testosterone levels by up to 30%.