The classic Romeo and Juliet tale is given a modern spin in “R#J,” an inventive but irritating film from director Carey Williams. The movie is too drawn-out (especially the painfully prolonged ending), and the gimmick of telling the story entirely through social media and smartphone screens doesn’t take long to become annoying. You know the plot of the world’s most famous love story, and the film faithfully follows the original work of literature. A war is brewing between the Montagues and the Capulets, and the younger residents of Verona are using their phones to document it all. This leads...