Paramount offered Yves Montand $200,000 for the role of Dr. Marc Chabot. Uneasy about playing another Latin lover, Montand made a counter-offer of $400,000, "just to see what they say". To his surprise, Paramount accepted.
According to the 1974 biography, "Barbra Streisand: The First Decade", this was originally envisioned as a 3-hour "road show" extravaganza, and included many sequences of Daisy's other lives (photos of which were printed in some pre-release promotions), but director Vincente Minnelli and the studio felt it would be too long, especially since musicals had already begun to fail at the box office. In addition to all but the briefest of Jack Nicholson's scenes being cut, a musical number sung by him, "Who Is There Among Us Who Knows?", with Barbra humming in harmony, was also cut, as well as a duet between Larry Blyden and Barbra Streisand.
The original Broadway production of "On A Clear Day You Can See Forever" opened at the Mark Hellinger Theater on October 17, 1965, ran for 280 performances and received Tony Award nominations for Best Score, Best Actor (John Cullum) and Best Actress (Barbara Harris).