The Manhattan-Hollywood Serious Movie Axis has a history of mocking the "fly-over states." Middle America's malls are a reliable bailout for many a big-budget studio picture, and what kind of artist can resist biting the saving hand? So when you find out that a screen version of About Schmidt, a novel by Louis Begley, originally set in the Hamptons, is set in Nebraska, your antennas go up - uh-oh, another big-city stab at American Babbittry.