It means that although Hollywood may seem to be a great place to live, and you can be famous and be in films, the truth is that it's far from that. Like when he says, "Hollywood Girl is lost again, all of her hopes left her stranded". It means that you can have your hopes of being famous, and having lots of money, but that sometimes that doesn't make a celebrity happy, that there's other more important things in life, and that you can hope to be big, but it can all go wrong in showbusiness.
It means that although Hollywood may seem to be a great place to live, and you can be famous and be in films, the truth is that it's far from that. Like when he says, "Hollywood Girl is lost again, all of her hopes left her stranded". It means that you can have your hopes of being famous, and having lots of money, but that sometimes that doesn't make a celebrity happy, that there's other more important things in life, and that you can hope to be big, but it can all go wrong in showbusiness.