I wish David Cronenberg would direct a script of his own again. A Dangerous Method is recognizably Cronenbergian in its careful anthropology (DePalma-esque, too, in its frequent use of the split dioptre), but it's also a hit-or-miss period talkfest, identifying it as a Christopher Hampton adaptation of a Christopher Hampton play through and through. Distilling all the expected body-horror in grotesque and painful-looking contortions of her jaw, first-billed Keira Knightley does fine if exhaustingly histrionic work as Sabina Spielrein, a patient of Carl Jung's (the ubiquitous Michael Fassbender) who becomes his apprentice while in therapy. Jung corresponds with the more…