Only one reel-to-reel tape machine was available to record the concert, however, resulting in gaps in some songs as the tape needed to be changed. These gaps have been filled in with bootleg recordings from the same tour. As a result, there is a drop in sound quality during these sections, but the concert is preserved almost in its entirety.
Much of the featured material had not been released at the time of the recording, including "Canard Toujours", which later became "Kreega Bondola", then later changed to "Let's Move to Cleveland", which was included on Does Humor Belong in Music? (1986) and several tracks that would later appear on Zoot Allures (1976). One song, "Kaiser Rolls", appears for the first time on FZ:OZ, and in two versions—the recording from the concert, which has had a missing section edited in, and a rehearsal version recorded before the start of the tour which is included at the end of disc two, entitled "Kaiser Rolls (Du Jour)". The lengthy guitar solo on "Zoot Allures" contains a section with extensive use of a "VCF" (voltage-controlled filter). This part was subsequently entitled "Ship Ahoy" when Zappa released its counterpart from Osaka (February 3, 1976) on Shut Up 'n Play Yer Guitar in 1981. It wasn't separated into its own track on FZ:OZ, however. This is Official Release #70.