Watch it at Amazon
Yes. The doll from Saw (2004) and its sequels can be seen leaning against a support beam in the room where Mary Shaw made her dolls. Look close. The doll is at the bottom center of the screen.
See: this FAQ entry
It is noticeable that in the unrated version it was tried to raise the tension via computer again. Additionally to the usual deepening of the story, some disgusting tongue-effects have been added. While the evil witch does not have such a flexible and slobbery thing in the R-rated version, several scenes of the unrated version have been spiced up, others are completely additional. A detailed comparison between both versions can be found here.
r73731
