Short Cuts: ‘An American Affair,’ ‘The Union’ and ‘Guns’

“Short Cuts” are expedient, pretension-free movie reviews. This installment tackles three somewhat-overlooked DVD releases: “An American Affair,” which solidifies JFK’s legacy as an unstoppable playboy; a documentary about the marijuana trade, “The Union”; and “Guns,” a Canadian miniseries which is only slightly more imaginative than its title.