Gay Undertones
Could the flirting between Howard and his buddy Arthur have been any less subtle? When they performed their musical number at the party, the googly eyes were pretty blatant. I suspect the director and producers were signaling that the movie's plea for tolerance wasn't just about race.
And no, I don't think that's a stretch. Consider: The actor playing Howard, Richard Hylton, was long rumored to be gay. He committed suicide in 1962 when the rumors drove him out of the business. And the actor Carleton Carpenter, who played the sister's boyfriend, was openly gay very early on, coming out to the public in the 1970s.
A pretty gay-friendly production, I'd say. A very cool example of post-war lefties getting their message across.