Sometimes I wonder how much of H!M is scripted and what is actually spontanious and comes from the girls themselves.
Even with the scripted stuff, there's still no knowing exactly what will happen. Kaori might go running across the stage frightened by a grasshopper, even when coached eri might still say lifulijeleta-, and sayu might dance the wrong way and be rescued by konkon.... :-)
I've wondered a lot about it too, but, regardless, they are the queens of serendipity!