Ellie: The original “Mamma Mia!” was based on the Broadway musical of the same name, and varied only slightly from the plot written for stage, which was one of its more criticized aspects. The plot simply didn’t translate cohesively to screen.“Here We Go Again” is a completely original story, the architect of which is none other than Richard Curtis, the king of romantic comedies. Known for power-hits “Love, Actually” and “Four Weddings and a Funeral,” among many others, Curtis has a knack for creating a world of characters with depth and complexity that the audience loves.Curtis, who also executive...