Welcome to L.A. (movie, 1976)

The lives of a group of Hollywood neurotics intersect over the Christmas holidays. Foremost among them, a songwriter visits Los Angeles to work on a singer's album. The gig, unbeknownst to him, is being bankrolled by his estranged father, a dairy magnate, who hopes to reunite with his son. When the songwriter meets an eccentric housewife who fancies herself a modern-day Garbo, his world of illusions comes crashing down.