I don’t know, but most reviews seem to describe the transformation in the present tense, so the scene is likely to start with them as humans and end with them as animals. But probably, given what we’ve seen of the makeup application, the main character will just look away from someone and when she looks back, she sees them as half-animal, and then looks away again, and they’re completely an animal. So process-off-camera. Hopefully they at least spend a few minutes in the makeup – they did a really good job on it.
Some of the descriptions of the scene:
http://2012.tiff-jp.net/news/en/?p=4264
Cassavetes: The dinner scene where the family members turn into farm animals… that is my family.
http://articles.orlandosentinel.com/...c-film-reviews
But that's hardly the chief absurdity of a prefab cult film wherein white-trash family members morph into farm animals at the dinner table.
http://www.reelfilm.com/tiff1209.htm
Cassevetes' off-the-wall sensibilities (eg an argument is presented as a stage play, family members morph into talking animals, Mary interacts with cartoon characters, etc, etc)
And the source of those three pictures:
http://thefutureheart.com/2011/06/22/yellow/
On the set of Yellow everyone's turning into farm animals…
And then REAL farm animals!!!
http://twitvid.com/G1FTL