One part "Harold and Maude," two parts "Love Story" and two parts Oregon teen ennui, the film errs on the side of formula even as it carries the sheen and delicacy of something handmade. With the Portland-set feature, Van Sant delves yet again into the ache and beauty of youth, embodied by the always impressive Mia Wasikowska ("The Kids Are All Right," "Jane Eyre")