Unfortunately after looking at your note, it does not look to be a real error note.
It has been seen before on similar quality notes that the serial number and design can be removed with the presences of certain chemicals. I am not saying that this is the case for your note... your best bet would be to have it checked with a reputable dealer. The other thing that should be mentioned is that the note has 2 major "Errors" which is almost unheard of on Canadian Bank notes. Yes errors do occur which are quite rare, but two errors on the same note??? Just not likely. If your note is confirmed to be a genuine error note it would be worth a few hundred dollars.