Towering Amy is way too old to be in the same class with Tabatha and the rest of the short kids.
The second time Amy says "But I want to be the butterfly," Robert (the boy in yellow) can be seen mouthing her line.
Samantha should have turned herself invisible to spy on Tabatha the first time as she has done previously.
Samantha could have caught the butterfly easily using her magic.
As the skyscraper construction workers talk just before Samantha pops in, the boom mic is visible at the top of the screen.