It’s been four years since Cameron Crowe, director of sticky, heartwarming all-American comedies like ‘Almost Famous’ and ‘Jerry Maguire’ last made a film – the very nice but forgettable ‘We Bought a Zoo’. Now he’s back with a Hawaii-set romcom packed with more celebrities than Vanity Fair’s Oscars party. We can’t quite get our heads around the plot. But Bradley Cooper seems to be some kind of military contractor on his uppers. The trailer opens with him getting a royal bollocking from his boss Alec Baldwin. Then he’s off Hawaii to fly planes with Emma Stone and have deep and meaningfuls with his ex (Rachel McAdams). It all looks typically Crowe – sunny and sweet – and we’re enjoying Bill Murray dispensing twinkly, hard-won wisdom in the trailer.