Quentin Tarantino and Robert Rodriguez’s celebration of 70s-style sleaze, 191 minutes long including a short intermission, seems ideally suited for gleeful, mean-spirited 11-year-old boys who can sneak into this double bill despite the R rating. I enjoyed the invented trailers the directors fold into the mix, but despite the jokey “missing reels,” these two full-length features are each 20 minutes longer than they need to be, and neither one makes much sense as narrative. Rodriguez’s “Planet Terror” is virtually nothing but gross-out gags involving castration, dismemberment, mass murder, zombies, and Osama bin Laden. Tarantino’s “Death Proof” starts off as a meandering look at Austin’s Tex-Mex joints—there’s more gab here than in any of his work since Reservoir Dogs—then gravitates into a blend of Faster, Pussycat! Kill! Kill!, Beyond the Valley of the Dolls, and stunt-driving movies, culminating in some well-filmed action and more celebratory killing. With Rose McGowan, Freddy Rodriguez, Josh Brolin, Kurt Russell, Rosario Dawson, and Zoe Bell.