On the flexidisc that came with each copy of the Billy and the Boingers Bootleg trade paperback (or, at least, came with the first edition), the song U Stink But I ♥ U was performed by the band Mucky Pup, and the song I'm A Boinger was performed by The Harry Pitts Band.

The 'liner notes' provided for the flexidisc appear to be a parody of the liner notes for Metallica's Master of Puppets. A comparison:

Billy and the Boingers Bootleg -

THANX TO: Milo B. (Don't worry, we'll replaster the basement...Awright!), Larry at Central leather and stud boutique, Esther at International Crabby Management (Kiss my principal tuckus, Victoria, eh?), Bill "Party Pony" Dickinson, Goober at Dino's Guitar Mart; also xtra freakin' yahooz to Don "Metalmaniac" Graham (Gummibears! Gummibears!), Lee "Clone Drone" Salem (We know wats in YER Anxiety closet!), Michael HoBO Fuchs (Bill ze Cat is comin to tinkle in yer dish!), Katie Mack...thanx fer the smiles and the groovy gams, babe. And thanks to the faithful Boingers Metalbashers who bought our last record. All 37 of you.

Excerpts* from Master of Puppets

THANX TO:...Andy "Lick my Syphilletic Piles" Battye...Russel "You're on glue, Mon" Majors...Joni (Get Receipts!)... Armored Saint (Handcuffs?!!)...Xtra special Yahoo to Mark W. (Gummibears!)...and Thanks to the faithful Bay Area Metallibashers...Also xtra fucken yahooz to...

I think you get the point.

Also, the bit about "rock n' roll royalties forever" in the Boingers notes seems a bit prescient of Metallica's later behavior in re Napster.

*Due to the length of the liner notes and Metallica's tendency to be, uh, "overprotective" of their work.