Apple isn't the only one with silk screen errors on their boards. The A3640 68040 processor card that came in the Amiga 4000 had a few backwards caps from the factory too.
Hehe, I think it's great that the article linked to the original thread about the issue over here! I didn't expect this to get as much attention as it did, but I'm glad it did -- I'm hoping this helps nudge all the cap replacement guides out there toward being updated to mention this little gotcha, for safety reasons over everything else.