 Most of the shots were done by an L.A. company called LOLA that specializes in digital " plastic surgery . " The technique involved shrinking Chris in all dimensions . We shot each skinny Steve scene at least four times ; once like a normal scene with Chris and his fellow actors in the scene , once with Chris alone in front of a green screen so his element could be reduced digitally , again with everyone in the scene but with Chris absent so that the shrunken Steve could be re @-@ inserted into the scene , and finally with a body double mimicking Chris 's actions in case the second technique were required . When Chris had to interact with other characters in the scene , we had to either lower Chris or raise the other actors on apple boxes or elevated walkways to make skinny Steve shorter in comparison . For close @-@ ups , Chris ' fellow actors had to look at marks on his chin that represented where his eyes would be after the shrinking process , and Chris had to look at marks on the tops of the actor 's head to represent their eyes . ... The second technique involved grafting Chris 's head onto the body double . This technique was used mostly when Chris was sitting or lying down , or when a minimum of physical acting was required .... 
