These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Angst? What Angst?: Phil is awfully chipper for being the last remnant of an age long past.
Awesome Music: The theme song is really an Ear Worm, honest. Some people have no problem remembering it even if the show last aired almost 20 years ago. It being based on a Paul Simon song probably helped.
Tear Jerker: Try not to think about what will someday happen to Phil the Mammoth in scenes that showcase him and his friends and other loved ones getting along merrily in the past.