This episode was banned in some countries. The live-action close-up of a horsefly's head was deemed too scary for children.
Wormy goes through a very quick metamorphosis from a caterpillar to a butterfly in just one night. In real life, Monarch butterflies (which is what Wormy is) take 10 to 16 days in the chrysalis stage while forming. This was lampshaded by Sandy when she said, "You weren't supposed to change till I got back."