I've posted the original scan (the one with the blue background not the certified copy with the green background) multiple times and challenged anybody to reproduce the graphical inconsistencies on that version.
So far no one's been able to do it.
You're welcome to take a crack at it though:
http://abcnews.go.com/images/Politics/ap_obama_certificate_dm_110427.pdf
Everyone in the conspiracy theory crowd has been analyzing the certified copy with the green background. The artifacts, aliasing, and layers are a byproduct of a document being scanned into an optimized PDF. National Review even replicated the effect.
Oh, such a “conspiracy theory” to doubt the veracity of the faux documents.
Such a nice little lemming you are.
National Review? Their biased analysis doesn’t count. Clearly, they’re just a bunch of shills for Obama. /s