Well, here's the deal with the book to film translation, I believe he not only referenced the Hobbit but also referenced the Silmarillion and possibly some other short stories that were meant to take place when the Hobbit did to fill the time and lengthen the movie.  I have not seen it yet but I'm not going into it expecting the same experience as the much darker Lord of The Rings. The hobbit was always more light hearted and it's unfortunate that it was the last of the books that were made into a film this go around, as people go to see it expecting something it was never intended to be.   If I have even half the fun I had with the Rankin/Bass animated Tolkien adaptations once I finally see the film, I'll be happy.