I was the VFX supervisor for this project. I had a team of 7 CG ninjas working around the clock to replace all the on-screen animation.
I worked under the very talented Marty Martin. themartymartin.com
UPDATE: Well… Facebook decided to take down their Paper app and I have no way of linking to it.
Now that this is something of the past, you can read about it on… you guessed it: Wikipeida!