In some scenes the "native" woman are black, in other scenes they're Asian, and in other scenes they're white.
When the octopus and the moray eel battle, you can see the octopus' tentacles stuck to the aquarium glass in several shots. And in one shot you can see the reflection of lights in the glass from outside the aquarium. Yet the battle is supposed to be under the sea.
When a native canoe rows beneath some palm trees, the trees are clearly hand-drawn and you can see the boat right through them. And when Jose fights the manta, you can see the manta and the ocean through him. There are hands holding him up in part of the battle scene, wearing black sleeves and back gloves.