Corrected entry: When Valiant grabs Roger after he is singing, dancing and smashing plates on his head, if you look carefully you can see that Roger is a frozen-stiff cardboard cut-out. This was to hide the machinery that was smashing the plates.
Rlvlk
25th Aug 2006
Correction: They made it pretty clear in the "Making of" documentary that each individual film cell was hand-painted.
Rlvlk