Possible Aquaman goof *spoilers*

I'm trying to work out which Goof category this would fall under:

Spoilers for Aquaman-

At the end of the Aquaman movie Temuera Morrison's character appears to have scales on his forearms down to his hands. It's the scene where he's hugging Nicole Kidman on the jetty, you see them at least twice. As he's meant to be human that seems a little odd.

Any help appreciated.