A couple of cards have a very peculiar hue to them.
18u37 is a good example. I really like shieldmaiden's scan of the card because it shows the difference to the other cards nicely.
BTW, I do not really buy into the whole misprint stuff. I do not see how defectively printed cards can become more than a novelty. If it is misprinted, fine by me, but I prefer the correctly printed stuff any day.