The Hobbit: The Desolation of Smaug

Etheir my memory fails, or Legolas is the son of Thranduil, making him actual part of this timeline, since Thranduil makes a LARGE part of The Hobbit.

So far everything showned seems good and not too far-off. Except the part where Elves and orcs fight while the poor dwarfs are on the barrels. From where did that came from?

He is the son of Thranduil, but well- he doesn't show up in the book at all and we all know he's probably in there because of fangirls. I'll wait for the actual movie to judge though since each scene might have added context that makes it work in the movie.