Continuity mistake: When Kung Lao and Shang Tsung are preparing to fight each other at the tournament, watch Shao Kahn. He gets up off his throne, then it cuts to wide shot and he's sitting down again. Then it shows him standing up again only to go back to sitting down a fraction of a second later.
Continuity mistake: When Shang Tsung transports the scorpion we see it enter a fire coloured portal in Outworld which then changes to a blue coloured portal on Earth Realm. In all other episodes the portals in the Earth Realm are fire coloured and the ones from Outworld are blue.