I had a $5 (I say had because I've since sold it on e-bay) 5 or 6 years ago, that did not receive printing of "Bank of Canada" on the left of the bill, the indentation of the words was there, but there was no ink.
the story goes as this: I had just started dating this girl(now my wife), who at the time worked at the casino here in Windsor, she quickly became facinated with my hobby of collecting money. One night she comes over after work, and shows me this bill that she had gotten, I was thrilled, and told it was worth quite a bit of money. She replied with, O, maybe I should have bought the other ones too.... Other ones I say!?!.... yea, their were 7 or 8 of them that all looked the same, that were in sequence,.... she didn't figure they were worth anything because they had 7 or 8 with the same error..... AUGH!!!