AS:

What posts do your two refer to?

jheem:

There is a fine book called Heavens to Betsy: and Other Curious Sayings by Charles Earle Funk, editor-in-chief of Funk & Wagnell's Standard Dictionary Series.

lysdexia:

Wagnall's

TEd:

Unless someone reading this knows different?

How many among you would write:

Unless someone reading this knows differently?

lysdexia:

It depends on whether one wants the state (adjective) or the manner (adverb)

I see that I never weighed in on the different/differently question. I would say that, unless the manner in which one was thinking was different that different should be taken as an adjectival noun and could be read as an ellision of Unless someone reading this knows something different.