Even the smallest can be strong -- and the weak can be courageous. Reinforces the importance of keeping your word/promise/oath and of helping those in need rather than believing it's not your problem. Thorin's obsession with his treasure shows the corrupting power of wealth. As someone says in the movie, the world would be a merrier place if people valued other people above gold.
The most violent of the Hobbit films: Huge battles with high body counts and brutal deaths. Many beloved characters die fighting their enemies (usually with swords and arrows), as do villains. Smaug kills countless residents of Lake Town as he murderously destroys it, setting fire to anything and anyone in his flight path. Some frightening, jump-worthy moments include Smaug cruelly targeting a man's young son (the dragon doesn't have a chance to kill him), the super Orcs battling the dwarves, Thorin threatening Bilbo, and the elves/wizards fighting the shadow of Sauron. Lots of intense, deadly confrontations between characters.
Kili and Tauriel continue their lingering looks and charged moments of connection, including an embrace, an "almost kiss," and a heartbreaking declaration of love. Legolas loves Tauriel, even if she doesn't return his romantic affection.
No product placements in the film, but the Tolkien books and Peter Jackson film adaptations have plenty of tie-ins to merchandise: apparel, video games, Lego toys and board games, role-playing games and costumes, special editions of the books, electronics accessories, posters and other home accessories, and more.