Using this photo, I would like to point out the fact that T-1000's Biker Cop with sword arm is NOT mixing parts from different scenes... After the helicopter crash, and T-1000 takes the Tanker Truck... he stabs the truck driver with that arm. They are just creating a very quick scene, while still providing us with an interchangeable regular left arm.
As for Donut head with two pointer fingers... stabbing Sarah scene.