Nothing scary I think it is a case to case basis. With me, they asked where I live because I had changed address from the time I sent my application to the time I went and picked up my work permit. I did not inform CIC of the address change and just changed my return address on my communications. The questions were with the visa officer (I am from a country whose citizens need visa to enter Canada), and the POE officers were "already given instructions", so you just show the letter you get either from CIC or your LMO if you are from a "visa-free" country, pay the Cdn150.00 (if you have not paid yet).