Other mistake: When Johnny Cage is fighting Scorpion in the forest, after Scorpion unleashes his snake-like spear from his hand but before the camera switches to Johnny, you can see the spear move down and it appears to be coming out of his forearm. Also the hole in Scorpion's hand from the spear is now gone.
Other mistake: As Reptile falls backwards over the table, you can see the brand name of the sneaker he is wearing on his right foot.
Answer: Noob Saibot is not in this film. He makes an appearance in Mortal Kombat: Annihilation as the warrior who emerges from General Ermac, the red-clothed Lin Kuei warrior.