In the “Social Network”, actor Armie Hammer play both of the Winklevoss twins, and amazed several people with the amazing detail in the work.  Combining split-screen effects with digital face replacement, a new short (available on the home release as well) shows how it was done.

Watch as Hammer and model/actor Josh Pence play both of the twins — doffing shirts and changing hairstyles midway through a scene to play the other Winklevoss — and how an elaborate special-effects system using medical lasers and a contraption straight out of The Fly made it so that Hammer’s face could be grafted onto Pence’s in certain key shots, including the movie’s celebrated regatta rowing sequence.


via See How The Social Network Made the Winklevoss Twins Through Special-Effects Magic — Vulture.