Inventive light sources
I loved the way that Diana goes for the boyfriend in the house and he activates his smartphone screen to deter her - but of course, such screens go off again after a few seconds...! And then the bit where she again has him cornered in the shadow in front of the car, and he uses his car keys to turn his car lights on, again deterring her.
Any other innovative moments like that?
Why are you here if you haven't seen the movie yet?