Spot the difference: One of these USPS holiday stamps is not like the others [photo]

This holiday stamp mailer is brought to you by the U.S. Postal Service. Notice anything missing?

@RennaW Was that from a flier?

— Matthew Balan ن (@MatthewJLB) November 20, 2013

@MatthewJLB A mailer I just got from our United States Post Office.

— Renna (@RennaW) November 20, 2013

Well, we’re certainly looking forward to celebrating Merry Gingerbread House Day! Aren’t you?

@RennaW oh yeah, because Christians celebrate the Holy Day of Gingerbread House, seriously? this is awful.

— BossyMother (@BossyMother) November 20, 2013

https://twitter.com/ChrisBarnhart/status/403299045986156544