This post is so perplexing. The first apostrophe is unthinkable; the second is perfect. How did the same person manage this mangled mess?

...an unnecessary apostrophe, that is.

Submitted by Ian Cummings

The style tips featured in this advertisement are far more unseemly than the apostrophe misuse -- and that's saying a lot!
Submitted by Julie Nelson

Submitted by Jill Ginsberg

Just a tini little punctuation mark would have made this correct... 

Submitted by Ian Cummings

The apostrophe error is glaring. Less obvious is the errant colon. Once again, the simple elements of a sentence should not be separated by internal punctuation. In this case, a colon is separating the preposition from its object. 

Submitted by Ian Cummings