I had to watch it again to see if i was missing something.... nope just a great ending to a great song.
Tom Petty and the boys were enjoying the solo as much as the crowd, and the chorus at the 'end' of the song was where it should be in this case.... in the background.

Again i'm not a big fan, but I thought he did a helluva job. Emotional riffs for a song with alot of emotion in it.
Nice sound coming from that old fender strat.

But what? where? did his guitar just dissappear at the end?
Maybe he's a jerk for guitar neglect?