As fun as they are, flashy, showstopping musical numbers cannot save “In the Heights” from the criticism that emerged on social media following the musical-drama film’s release in early June. The motion picture, created by Lin-Manuel Miranda, writer and star of the Tony-winning Broadway musical of the same name, was difficult to watch. This was in part due to its failure to center Afro-Latino actors, despite taking place in the New York neighborhood of Washington Heights, known as the “Little Dominican Republic.”