So, on the Lovesexy Sendai boot, CD 2, there show finishes up after 6 tracks. What is the rest of the boot? There are 22 other tracks, and I'm not sure if it's a rehearsal or what. Any ideas?

And is the artwork just the picture of him w/ his head down and his blue jacket over his shoulder?

I guess you have the Premium release. The remainder of Disc 2 is :

Lovesexy Tour Rehearsal - Paisley Park : 5th April 1988

7. Erotic City 8. Housequake 9. Slow Love 10. Adore 11. Delirious 12. Jack U Off 13. Sister 14. Adore 15. D.M.S.R. 16. Soft And Wet 17. I Wanna Be Your Lover 18. Head 19. When You Were Mine 20. Little Red Corvette 21. Pop Life 22. Controversy 23. Dirty Mind 24. Superfunkycalifragisexy - Controversy 25. Bob George

Taken from : http://www.thedatabank.org
[Edited 10/9/09 20:30pm]

Is that rehearsal part of the already-released Lovesexy rehearsals?

You edited that quickly!!!
Not on Sab's Lovesexy Tour Rehearsals set, but on their "The Trojan Horse Aftershow" release or Moonraker's "Funk City".
[Edited 10/9/09 20:52pm]

thebumpsquad said:

So it's stuff already out then. I don't need to rerip that rehearsal stuff.

^Yeah.
If you have either of the above, you are good.

The only Lovesexy rehearsal which isn't circulating (and is known to exist) is an incomplete one from early 1988 (early in the sense it includes Soft & Wet which was dropped early in the rehearsal process). It's s/board, but it's extremely basic with very little chatter, and nobody is missing out on anything by not having it.