| Country | Tracks | Format | Catalogue | Comment | Rating | Status |
|---|---|---|---|---|---|---|
| Mexico | BACK CHAT/Back Chat [picture - 45k] | 7" | EMI SEC 206 | promo, dark orange/brown vinyl, possibly a mispressing | scarce | definite |
| United Kingdom | NO ONE BUT YOU/TIE YOUR MOTHER DOWN/We Will Rock You(ruined)/Gimme The Prize(inst) | 7" PD | Parlophone QUEEN PD27 | mispressing, insert lists Princes Of The Universe instead of TYMD | uncommon | definite |
| Country | Album | Format | Catalogue | Comment | Rating | Status |
|---|---|---|---|---|---|---|
| United States | A Night At The Opera | CD | Hollywood HR-61065-2 | withdrawn promo, mispressing with no "There he goes again" in GOFLB | uncommon | definite |
![[picture - 45k]](https://www.pcpki.com/queen/pictures/backchatmx.jpg){kind=link}