All Night Long began as a comparatively modest romantic comedy built around Gene Hackman and Lisa Eichhorn, but its production was dramatically reshaped after filming had already begun. Sue Mengers, the powerful Hollywood agent representing Barbra Streisand—and also the wife of the film's director, Jean-Claude Tramont—proposed that her longtime client and close friend replace Eichhorn as Cheryl Gibbons. The change transformed the movie's financial scale: Streisand received $4 million, reportedly the highest salary ever paid to an actor at that point, and the film's original budget of roughly $3 million eventually ballooned to about $15 million. The casting decision therefore carried an unusually intimate mixture of agency influence, marital connection, and studio economics, with Mengers effectively advocating for her own client on a picture directed by her husband.
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