some points on Hollywood classical films

There are lots of common features in Hollywood classical films, for example, heroic, love or romantic themes, struggles between characters, causality and happy ending. In classical Hollywood films, characters always have their goals. And in the middle of the scene, they starts to show them by struggling, making choices or appointments which affect the future events and open up new causal lines. And then, most films end happily, but usually for the main character. However, it is worth pointing out that even the classical ending may not be happy for everyone. The fates of second character may be unsettled. For example, in One hour with you, the doctor couple finally get a happy ending which they forgive each other for love and by contrast, the professor actually does not get what he wants but lose his wife. And in The Pink Panther, even the inspector gets some substitutes like the popularity of women, but he is set up and jailed at the end.