When the player defeats Inferno Scorpion in the NetherRealm, there's a cutscene of Kung Lao putting Scorpion into the lava pit. As Scorpion is being dragged down by undead skeletons, he sinks down with a thumbs up. This is a reference to the end of the film Terminator 2: Judgment Day, where the Terminator dies in the vat of molten steel, while giving John & Sarah Connor a thumbs up.
Contributed by ProtoSnake