None.

A man has been killed, as we see a hand about to sink under a swamp.

Lois Lane is chased by several people, until she finally gets caught and put into a torpedo.

A man is hit and buried under several tons of scrap metal, but doesn't die.

Superman fights several people.

None.

None.

Despite this Superman cartoon being aimed at children and families, the opening sequence which implies a murder may kinda disturb some younger children.

Mr. Jones plans to blow up a certain factory.

Lois Lane is put into a torpedo to be tested, and launched toward a dummy ship.