I saw that 'moon' also. I think it was sometime around 1990, give or take a couple of years. The center of the bottom was dimpled inwards and it seemed far off. It was like the moon was positioned in the wrong spot.
Are you serious? It was in the wrong spot by about 45 degrees. Strange thing was, it would not show up on film, as I had some cheap throwaway cameras, and only pic showed at all, and everybody that sees it says it is just a flaw.