I rented a VHS video years ago with the famous saw scene in it.
It had a strange jumpy effect.
The scene stopped for a second just before the saw hit the head.Then you see the saw in the head and the guy fell down.It was obvious it was a tricked scene with stil images used.
The later versions i saw had removed the saw scene.
I trued to find the VHS movie with the scene on it,but it was lost,a friend who had a copy on Video 2000 Philips system looked for me on the attick and i found the machine and all the taped..sadly the taped where erased with footbal matches!