Interestingly, when looking closely at the back of the "SEGA Classics" version's box, only one of the screenshots have "RINGS" in the HUD while the others read "RING". Said screenshot of Marble Zone also seems to have a different palette than the others, (and is also different from its counterpart on the original N. American case). This one has a palette closer to the final game. After taking a look at the other releases, the Korean box also has this inconsistency. The Brazilian box has one screenshot that says "RING" in the HUD (the others were HUD-less shots, one of the Title Screen and one of an oddly HUD-less Special Stage). Though these things are probably already well-known, I just noticed this. Was Sonic 1's release that rushed to the point of using pre-final screenshots for the boxes?