'Stunt Man ' is exhilarating, cynical, movie-lover's film (Continued from Page 19) brags, "If God could do what we can do, he'd be a happy man." The film is quicker than the eye, and what we see is not always what we get in movies. Everything that happens - or seems to happen in this elusive film is subject to instant revision. If at any moment we don't know what is going on, we only have to wait another moment. Our expectations are constantly trumped. Audiences who like the comfort of the Same Old Thing will come away from "The Stunt Man" wondering what it was all about. Those who cry out for something new will embrace it. You really don't need to know any more about the plot. In fact, proper enjoyment demands an element of surprise. It's much more fun if you don't know what to expect. Take special note, however, of Dominic Frontiere's wonderful musical score. Chuck Bail's ingratiating performance as the veteran stunt man, Mario Tosi's beautiful photography and the overwhelming vitality that director Richard Rush has instilled into this one-of-a-kind movie. The film is rated R because of strong language and a fleeting bit of nudity.