Alternate Character Interpretation: In a meta sense. Father Time is most often depicted as a stereotypical 'wise old man' with a long beard. Here he is a loud and obnoxious, but kind-hearted, blue-skinned man who casts spells with a club. He still has a beard, though.
The rhino episode has Nasty Corp kidnapping a rhino mother in order to market their Rhinoplasty, which apparently involves surgically implanting a rhino horn onto a person's face. The rest of the episode has the Yoo Hoos getting the babysitting the baby rhino so he can tell them where his mother is.
In "Weeping Willow", an anthropomorphic tree that cries is used to make tissues, and its tears end up creating a flood that serves as the premise of the episode—while the tree itself doesn't appear until the final minute of the show.