When first victim is on the autopsy table, she can be seen breathing very clearly.
When Stefano and the old man go into the dark with flashlights, they obviously reflect on the camera.
Old man can clearly be seen moving while being dead when Stefano jumps down the wall while running away.
When Stefano and Guido are swimming it is Guido who bumps his head against the wall of the swimming pool when he reaches it.