Michael Cera is laid back to a point approaching the horizontal in a comedy about a 16-year-old who lusts in hapless dreams and whose divorced parents are both shacked up. When his character, Nick Twisp, meets the lovely Sheeni Saunders (Portia Doubleday) during family vacations to the Restless Axles trailer camp, it’s love, but it’s not simple. Cera’s self-effacing style works nicely with his urgent desires. — Three stars