Continuity mistake: At the start of Phil's song, he is standing on a pillar. The angle of this pillar varies between shots.
Continuity mistake: When Pain and Panic are shown for the first time, the cracks on the ground change between shots.
Continuity mistake: When Hercules comes to the underworld, he sees Meg floating in the river next to a lot of other souls. Then as Hercules reaches down to get her, hardly any souls are floating next to her. (01:11:25)
Continuity mistake: Hercules has his ribbon around his neck in the temple. As he's praying, a wind suddenly blows up. The ribbon around his neck is gone when this happens.
Answer: Orpheus was the greatest poet and musician of Greek mythology, his music could charm wild beasts and even persuade rocks and trees into movement; the idea of him arranging flowers is probably just a pun on his normal pasttime of 'arranging' music, or alternatively a reference to how he could have used his magical music to make the flowers spontaneously arrange themselves.