After Arnold, Sarah, and John leave the Cyberdyne building, they are in a S.W.A.T. van being persued by the T-1000 in a helicopter. A little ways into the chase, Arnold slams on the brakes, causing the helicopter to smash into the back of the van. This is clearly seen. But the next shot shows, for about 2 seconds, the helicopter back in full, undamaged state behind the van. OOOPS! Not even the T-1000 could've done that!!!!