I think calling the Bootleg The Beginning Of The Mirror is a bit too long.
LOL! I think rumby was referring to the name of the song, not the bootleg.
But to answer your question rumby, I think it actually is thanx to the band and/or MP, since they were the ones to continue referring to it as Puppies on Acid, instead of part of The Mirror. If you look at OiaL or the LA official bootleg (1998/05/18), you'll notice that it's referred to as Puppies on Acid on both of those releases; even when MP was giving me the setlists for each show, it was always listed as Puppies on Acid. So it stands to reason that the fans merely followed suit.