Is there much of a noticeable difference between the "raw" broadcast, and the overdubbed HBO special?
All I have is a fairly lousy sounding
audience recording of the unedited show -- not the one that apparently ran in DC on the FM and in NYC on the AM. I'd reckon that those "pro recordings" would probably be a better frame of reference if anyone has them.
I will say this much though: It truly is a "sound to behold" when Brian suddenly becomes audible on "Wouldn't It Be Nice," as the song starts to progress along, for that '80 show.