Your note would not be considered a ghost note; it looks to be of the offset printing variety.
Here is a $2 note that I have seen recently very similar to the $20 pictured. I have seen the $2 note in person, and I question the authenticity of this being a true 100% error note from the Band of Canada, and not a homemade manufactured error on a home computer printer or something of the sort.
The $2 note overprint had a linen look to it, and the lines in the picture, wording and signature were not smooth, very jagged like a box pattern.
Just my thoughts, as you need to see the note in person to make a call.
Cheers
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