Sometimes it pays to read the fine print. Toward the end of the press notes accompanying “Moon Garden,” the new movie by Ryan Stevens Harris, there is a list of “fun facts.” The first item concerns the medium itself: Mr. Harris and his cohorts used 100,000 feet of 35mm film stock, the majority of which was recovered from a basement at Omaha, Nebraska. Not only is the stock antiquated by contemporary standards, it has also expired.