Corrected entry: When Cleo sprays Zane with the fire hydrant, she unscrews the hydrant's cap. She shouldn't be able to do this because she controls water, not objects.
Corrected entry: The girls say they hold their breath underwater for fifteen minutes. Why do they need to hold their breath at all? Aren't they mermaids?
Correction: As they do not have gills they wouldn't be able to breathe underwater.
Moon Spell - S1-E7
Corrected entry: In the episode "Pool Party", Lewis cannot lift Cleo in mermaid form because of her weight. But in this episode, the girls are able to push Emma around on a wheelchair in mermaid form without breaking sweat.
Correction: Lifting someone, and pushing them in a wheelchair are two entirely different things. I can't lift my 600 pound motorcycle off the ground, without straining really hard, but I can wheel it around with very little effort.
Correction: Even though she only moves water there is water inside it so she is able to control anything that had to do with water. Just like in the episode where Charlotte gets her powers and shows them she didn't only move the water, at first she moves the vase then the flowers start to move, then she moves the water.