It’s been 50 years since “Guess Who’s Coming to Dinner” was released in theaters. When Columbia Pictures found out what the movie was about — a black man and a white woman in love — studio executives did everything they could to stop the filming. “They kept saying, ‘Nobody’s going to ever come and see this film. We’re going to lose millions of dollars on this film,’” recalled actress Katharine Houghton, who co-starred alongside Sidney Poitier. Read more.