I'm not sure if this is a bug or intentional, but...
When I tap on the magic flowers that shoot energy balls at enemies (not sure of the name), they activate regardless of whether or not I've TAPPED them or just placed my finger over them while scrolling around the map. So, if I slide my finger over a flower and the line that I draw across the screen to scroll starts on that flower, then it activates.
Is this on purpose? It does make it a little easier to fire off the balls of energy, but I also accidentally set them off without meaning to.