Grindhouse. A double-bill of thrillers that recall both filmmakers’ favorite exploitation films. “Grindhouse” (a downtown movie theater in disrepair since its glory days as a movie palace known for “grinding out” non-stop double-bill programs of B-movies) is presented as one full-length feature comprised of two individual films helmed separately by each director. “Death Proof,” is a rip-roaring slasher flick where the killer pursues his victims with a car rather than a knife, while “Planet Terror” shows us a view of the world in the midst of a zombie outbreak. The films are joined together by clever faux trailers that recall the ’50s exploitation drive-in classics.