The message of the film is quite clear from the get go. A white woman should not be frowned upon for being in a relationship with a black man, and vice versa. that as long as there is a true love connection then it shouldn't matter what ethnicity anyone is.
The acting was phenomenal, at no point did i ever feel as if i was watching anyone act. It all felt quite real. I think thats why the movie sends such a successful message to the world at that time. A message that is still useful even today.
Of course the cinematography was great tool used importantly in portraying the message. there were many incredible close ups of the characters in their most vulnerable states. the skill used in these shots truly helps to feel the struggle and emotion felt by the characters.