I re-watched Her for about the fourth time the other day. I think it's just brilliant.
One theme that really resonates with the current series on Buddhism is that of impermanence. We are not the same people, and thus our relationships are not the same relationships, from one day, one month, one year to another. As shown in the movie, this is both exciting and challenging.
Overall, Her is a fantastic exploration of what it means to be in relationship, any kind of relationship, with another changing, evolving being.
It also contains a "hyper-intelligent," non-physical version of Alan Watts, so there's that...