Loud
This is the loudest 'quiet' movie I've ever watched. Julie Harris was certainly effective as Frankie and the angst of a pre-teen. But the screech! I wish she had taken it down a notch. IMO it would have given the performance more impact.
There's a difference between acting on stage and acting in film. With a camera on you there's a nuance that can be provided that can't on stage, where projection is everything.