In Shang Tsung's "King Cobra" Animality, coils around the opponent before crushing them and biting on their head, twisting their body in the process. The cobras can't crush.
Shang Tsung's Animality, Cobras have round pupils, not "evil looking" slitted ones.
In Peacemaker's "Pest Control" Fatality, a butterfly comes out of the opponent's mouth, and Peacemaker accidentally kills the enemy trying to shoot it. However, in the show of origin, once a butterfly enters a host, the human is killed so the parasite can take control. The enemy should already be dead when the butterfly exits.
The man who confronts Shang Tsung in the beginning to expose him on his scam claims that he had the potion tested by an expert woman only to find out that it was just tea, despite the fact that his daughter already drank it.