Could you tell me as many of the questions as you specifically remember, and how you have categorized them?

I am in Canada and going through a polygraph program.   

The instructors say that you can always detect when someone is using countermeasures.  Is that true in all cases?

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It's rarely true. If a polygraph subject employs, say, gross physical movements, a sensor pad might detect that. However, the polygraph community has no coherent methodology for detecting sophisticated polygraph countermeasures, that is, the kind that anyone who understands polygraph procedure would employ. You'll find such countermeasures explained in Chapter 4 of The Lie Behind the Lie Detector.

"gfd's" remark that "those who just read about [countermeasures] are like fish in a barrel if the examiner follows the rules" is unsupported by any published research.

Another source to consult is the American Polygraph Association in bordering US states.   

In some cases members in NY, VT and WA state members  consult and know his/her Canadian counterparts. 

While the Canadians  have a good association, the APA in the USA is a plethora of good  information for all things polygraph.