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.
Fridge Brilliance: Why, when the Power of Ten is used on Simon and Snarf, do they not go away for good? Because, as revealed later, Zirconia and Spinell's powers had been drained during their imprisonment, so the spell wouldn't be at full strength.
Fridge Logic: So the Ancients were around the same age as the girls when they fought Simon 3,000 years ago. That means Zirconia and Spinell were either married as teens, or they were married after being transformed.
Tear Jerker: The montage of the girls coming back from the Old Trollz' Home wet and miserable in episode 9.