The one thing I love about the original studio version is where the synths break into harmony when they go into E major towards the end of the instrumental. It's hard to describe, but it's where they go into E for the last time, after the sixteenth-note arpeggios in D, then they stay in E for the segue/reprise "Aisle of Plenty". On the Seconds Out version, Tony plays that line without the harmony, and I think it's lacking something. When he does it during the medley on the Three Sides Live version, he does it in harmony, as on the studio version. Even though I don't really like how they chopped it up for the medley, it was cool to hear the harmony again in a live setting.
That's really about it, besides Peter's tooting around on the flute during the first break. It's not much, but it's kinda cool. I always liked it when he broke out the flute, because the flute is one of the first instruments I learned to play.
Yeah, I'm a music geek.