This 1981 release is one of Brian De Palma’s more interesting and better-made thrillers, though it’s even more abjectly derivative than his Hitchcock imitations (borrowing mightily this time from Antonioni’s Blowup, as the title suggests). John Travolta plays a sound-effects man working in Philadelphia who, like many a De Palma hero, finds himself stumbling into trouble. With Nancy Allen and John Lithgow. 107 min. (JR)