None whatsoever.
At the border, I was asked...
- how long were you away?
- what's the value of the goods you have brought back with you?
- any alcohol or tobacco?
- any firearms or ammunition?
Then, in the office, I was asked...
- where's 'home' right now? (Winnipeg)
- where was home before you moved to Canada? (London)
- when did you move to Canada (2013)
- do you have any 'settlers effects' to follow? (no, everything is already in Canada)
- do you have any other work permits/documentation from CIC? (no, the currently valid one is in the passport - the previously valid one was taken out by a border officer when I flagpoled last)
He ran me through the questions on the COPR, to which I needed to answer 'no', and initial them, then asked me to sign both copies - he kept the one with the photo, and the one without was stapled into my passport alongside a stamp which had my PR number on it. He stated that I could use my COPR in my passport to cross land or marine borders, but not air borders, until I receive my PR card. Once I have the card, I should remove the COPR and store it safely - that's your proof of landing, and will be needed for applying for citizenship.
He then ran me through a list of things new permanent residents should know (residence requirements, being unable to vote or run for political office, how long to wait until applying for citizenship, waiting up to 12 weeks for my PR card). Then we had a chat about the bureaucracy of the immigration process, the stupid delays, the weird ways in which CIC works, the fact the guys at the border can do nothing about it...
Finally, he shook my hand, congratulated me, and welcomed me to Canada!
The whole process - from driving up to the booth, to leaving again in the car, took less than 30 minutes.