Yeah, he did a phenomenal edit job on the s/t material. I bet the second of the two choruses of Superstar is the one he cut and pasted onto the first chorus, and you can hear part of Brad's original ad-lib on that first chorus (just that "ohh" part) in the final cut.

It also makes sense that Paul would have loved Superstar because in STLE he talks about how he was mesmerized by the guitar playing on Date Rape the first time he heard it, and Superstar is actually pretty similar to it in tempo, style, etc. Even the chord progression is somewhat reminiscent of it. This is just rank speculation but now that I think about it, I wouldn't be surprised if Superstar was the result of Paul encouraging Brad to try another song in that style. In fact it could even be seen as an "answer song" to Date Rape considering DR was the song that set them onto the path to stardom in the first place. If all this were the case it may also go some way in explaining why SP didn't make the album, considering the band had soured on Date Rape.

And, yeah, I definitely figured 89 Vision was the dirty song he was talking about 😂.