The accent of the chief villager is Jamaican, or at least Caribbean, not Nigerian. This is incorrect. He is actually Nigerian. His accent is a Nigerian British accent. As pretty much every person of African descent in Jamaica as well as every human of African descent in the Caribbean is either descended from or are from Western Africa, which includes NIGERIA, it means that he does have a Nigerian British accent because that is what the Jamaican and Caribbean accent is.
About 6 minutes into the episode, there's a shot of zebra running across savanna with the caption NIGERIA, AFRICA. Nigeria is in western Africa; zebra live in eastern and southern Africa--thousands of miles away. The terrains are completely different--and the only zebra you might find in Nigeria would be the same as in the U.S.--in a zoo.