It's a sign that the States doesn't keep up with the times. We should have ditched Crane's cloth for polymer banknotes ages ago.
In general our currency reflects a stuffy and uptight attitude. Canada seems like a guy that says "fuck it, we're doing birds for 15 years"[0] or "How about Hockey, eh?"[1]. They've put the CanadaArm on the $10 [2], we've been to the fucking moon and only have the Eisenhower dollar where there is some moon [3], but not without that damn eagle, again. Instead we get "in god we trust," pictures of buildings and the only hint of changing anything more than shuffling the layout is occasional rumblings to put St. Reagan on a bill.
[0] http://en.wikipedia.org/wiki/Banknotes_of_the_Canadian_dolla... [1] http://www.cdnpapermoney.com/images/Journey/2002_005b.jpg [2] http://farm9.staticflickr.com/8542/8694157272_a1323d9017_o.j... [3] http://en.wikipedia.org/wiki/File:1974S_Eisenhower_Reverse.j...