Well, Kathy, I certainly didn't find Peter Townshend's use of his song in the closing credits of the film "crass" at all. As far as "divine love" and spirituality goes, Look Who's Talking tells the story of a troubled single unwed mother who by chance meets a man who bonds with her child and soon comes to love the boy as his own. Indeed, the first words spoken by the boy in their presence is "Dada." She soon falls in love with him and they marry thus providing the boy with a loving upbringing.
I wish every sad story like this can have such a happy ending. The closing credits show the miracle of fertilization of an ovum and conception of what will be the boy's half-sister. And thus, I consider this an example of "divine love" and an appropriate use of Let My Love Open The Door.