I just checked my cic account and it was updated and my aplication is approved. One more step, wait for paper and go to the border. Can't wait after long 5 years
If it's just one or two letters I wouldn't worried to much. If it's completly different city than could be a problem. Just pretend that you didn't notice
I am from Croatia so I don't need visa and in this case I am sending only copy of my passport. You'll see when you get ppr if you have to send original or copy