Audio problem: In the final fight scene between Liu and Shang Tsung, Liu hits Shang in the face repeatedly, but there is one extra hit sound for which there is no motion.
Audio problem: Right before the film ends, the giant spectral Shao Khan says the line "You weak, pathetic fools! I've come for your souls!" His mouth more-or-less matches "You weak, pathetic fools!", but it doesn't match "I've come for your souls!" in the slightest. (It looks as if he's saying something else entirely, and they dubbed in a new line in ADR).
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.