“It Follows” is a collection of compelling ideas trapped inside a movie that isn’t as sharp as it needs to be. It’s the second feature from writer/director David Robert Mitchell (“The Myth of the American Sleepover”), who maps out an unusual ghost story using familiar working parts, marrying a John Carpenter/Stanley Kubrick audio and visual aesthetic to contemporary indie film stasis, searching for ways to extract terror out of stillness. “It Follows” is accomplished work, always interesting to watch, but it doesn’t quite live up to its potential, finding Mitchell scrambling to reclaim suspense lost to budgetary and thespian limitation. Read the rest at Blu-ray.com