Well, they eventually put them all in, but it is really like they put slips of paper in a hat that said HP1 through HP7 and randomly drew out a couple and mashed the main plots of them all together in one musical. And the ones they didn't use for the first musical went into the sequel. If you have never read or watched Harry Potter you would have no idea what the crap was going on.

Oh and Draco is played by a girl named Lauren who rolls on the floor.