Jigsaw: Congratulations. You are still alive. Most people are so ungrateful to be alive. But not you. Not anymore.
After Dr. Lawrence cuts off his leg and is crawling towards the gun, if you look at his dismembered leg, you can make out the shape of his foot hidden beneath his ripped up slacks.
On the DVD these interesting facts were told by the directors and writers: the character Adam is actually the co-writer of Saw. The Saw was only shot in 18 days and under 1,000,000 dollars, and it all took place in 2 warehouses and the writers/directors came up with the idea by wanting to make a movie that revolves around a single room and the people trapped inside.