Nick Hashimoto calls the snake Seth even though he was never told that was its name.
During the hunt for the snake, Buck's camouflage face paint keeps changing between shots. In some shots, it covers the entire face and looks freshly applied, in others, it looks faded, smeared and partially wiped off.
The snake in this movie has a spectacle shape on the back of its hood which is the trademark for the Indian cobra (naja naja) not the king cobra (ophiophagus hannah) (although it could be argued that the Indian cobra is acting, and playing the part of a king cobra for the movie).
Snakes do not play dead as a tactical strategy to attack as suggested in the film. They play dead when they feel cornered and cannot escape. It's a defense tactic. Not a predatory one. And neither King Cobra or rattlesnakes do this.
King cobras are indigenous to southeast Asia, not Africa. So technically, there's no such thing as an African King Cobra, although there are numerous species of cobra in Africa. The King Cobra itself is of its own genus, Ophiophagus Hannah, which translates to snake eater.