There's a gem here and there in Chicago, but my favorite is the moment where the lawyer's manipulation are portrayed by showing him as puppet master (the puppets being the murderer and the press), and the song accompanying that scene.
There's gems here and there in the rather overrated Annie Hall (EG, when the protagonist speaks to strangers, and part of his character when he gets honest and straight-to-the-point). The movie however tends to drag and seems pointless, more of a mental exercise and an exploration of one clumsy, confused guy. By the way, this is the only movie so far that I've ever enjoyed Diane Keaton's performance.