Bob Byington’s “Somebody Up There Likes Me” is about a guy who doesn’t grow up. In fact, he doesn’t even age over the film’s span of about three decades in his life. It may have something to do with a mysterious briefcase, the origins of which are only ever suggested by animated cloud interludes and the ethereal implications of the title itself. But that hardly matters, so long as Max (Keith Poulson) keeps bumbling through marriage, money and mortality.