An easy way to tell whether a CSA note is real or a reproduction is to examine the signatures: the genuine notes were nearly always signed by hand, with pen and ink. The ink colour is normally brown, sometimes red. On the reproductions, the signatures were done as part of the printing process, and will appear black. I am going from memory here - my copy of Slabaugh's book is 60 km away at present - but I think this will help you distinguish most of the reproductions. If memory serves, the 50 cent notes were not always hand signed, but otherwise exceptions are few.
A lot of reproductions came out about 40 - 50 years ago and were included as a "bonus" with slabs of pink bubble gum. These are much smaller than the real notes, and of course are not hand signed.