Pointing out awful errors from bad photoshopping should do it.
Check out PhotoShopped for some chuckles.
* * *
Funny thing is, I remember seeing some of these images at the grocery story and the movie theater, but I didn't really notice. They might not have looked right, but I didn't think on it long enough to figure it out. Sad state of affairs when we don't notice when a movie poster portrays someone as having only three fingers...maybe if she'd been green and in a spaceship...