This is the type of "error" typically listed: http://www.ebay.ca/itm/Crosscut-2-0...225?pt=LH_DefaultDomain_0&hash=item5ae776f3e9
I believe the example above is actually illegal to create. If the net effect is to render currency unspendable, I believe this is a violation of law.
Now that most notes are machine cut, it's unlikely that such a dramatic error will slip by the BEP inspectors. You can tell that this is not a printing error, but rather a cutting error. Most printing errors will have one side more aligned than the other. You can see that the obverse or reverse is well aligned, while the other side is dramatically shifted. When both the obverse and reverse are misaligned in the same way, you're probably looking at a cutting error. For one note to be miscut like so, the remaining sheet would end up the same. I doubt an entire sheet of such notes could get past even a blind inspector.