None, besides from an implied birth of a child.

The King threatens to have the Miller dead by saying "we shall see if you can continue to live...and breathe".

A worm and a slug are apparently crushed by Rumpelstiltskin's hands, but nothing is seen.

None.

One scene has wine drinking.

The King threatens to have the Miller dead by saying "we shall see if you can continue to live...and breathe".

Rumpelstiltskin is a somewhat scary character, especially later in the cartoon. The forest is kinda scary as well, due to the trees with demonic faces.

This cartoon TV-special is pretty much G-rated.