A few of the tribes people can be seen bare chested, but otherwise none.

A plane is shot down. It is implied it's pilot dies, but Lois Lane survives.

A few people try to shoot Superman, and this is followed by some fighting.

"Stubbornish" is uttered once.

A couple of Swastikas can be seen on Nazi submarines.

None.

Despite this Superman cartoon being aimed at children and families, Lois Lane is gonna get burned at stake, something which could disturb some younger kids a little bit.