1) I learned that Gollum  is made using motion capturing and not CGI. I thought he was just cgi but he is actually a 3d Model following the movements of an actor in a special suit.
2) Second I learned that this technique is also used to make trolls, orcs and the goblin king. It was smart to make most of the things with technique so they look similar and lifelike.
3) lastly I learned that this technique is also used to make expressions. This is intresting because than they would also use it for lip sinking which i can imagine is not easy.

But what i want to know is does this movie take place before or after the lord of the ring movies?