I wanted to write a much longer piece on this, but I pulled back ; )
I agree that the Hanna scene is likely intentional. The idea of heaven and hell, when defined for different people varies greatly; while an abundance of money may be "heaven" for one, that same scenario is "hell" for another, for example. The central characters being homeless is a clever cover for a central, highly intellectual topic for us all: defining happiness. The film revolves around family. Beyond that, developmental and environmental influence begin to take hold and shape the questions posed to the viewer. This creates interest in the subject matter. Mixing in the concept of cyclical, non-discriminatory miracles reinforces positivity and belief in the world (created and "real"). Unlike Satoshi's other works, reality and surreality here is subtlely appointed. The clever cover makes it accessible and believable/watchable for a much broader demographic.