Although there doesn't seem to be anything hidden in the cover art, a closer look at the [http://www.flickr.com/photos/nineinchnails/3046739751/sizes/o/in/set-72157609404567115/ inner booklet] of the CD/DVD shows the phrase "WE DESERVED BETTER THAN THIS", along with "YOUR GOVERNMENT (Illegible)" and "AIR" scrawled on an abandoned house in a polluted wasteland. It is unknown if these were part of the ARG or led to new websites.
The art on the back cover and interior panel is adapted from a photo of the Matosinhos oil refinery in Leça de Palmeira, Portugal.
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