Another anecdote says that Humphey Bogart was only brought on because Cary Grant was either unavailable or turned it down. In my opinion, Humphey Bogart’s subdued approach to the role is what makes the film work. William Holden, while excellent and perfectly cast, has an acting style too similar to Cary Grant’s. Humphey Bogart provides the perfect contrast to the part.
While similar in some ways to Wilder’s Love in the Afternoon (1957), this film is (IMHO) much much better. Clever twists and turns keep this screenplay moving. I’ve retyped the entire screenplay (the October 7,1953 draft of “Sabrina Fair” called “Final White Script”) in fountain. It is copyrighted and property of Paramount Studios, but if you would like a copy for educational purposes only, feel free to email me at fablestofilm AT gmail DOT com. Hopefully the study of the screenplay will encourage you to rewatch this terrific film.
For more on Ernest Lehman, read the excellent book "Ernest Lehman: The Sweet Smell of Success" by Jon Krampner.