As an afterthought, I realize the differences between the Retroactive tracks and the B sides may not be that much...however the point of the inclusion of everything on this set is to cover everything that was released with Hysteria, from the album through all material released in conjunction with it at the time via the singles. So it's a completist set. I would not have been happy had they excluded the 4 B sides on the first disc.

If you are wanting rare stuff like acoustic versions and live versions of songs like Rocket..there is always the Box set.