Hi, yesMcDutch said:As a Dutch person you don't need a Visa to enter Canada. You CAN get some trouble at the airport if you are trying to fly on a one way ticket, but you can usually talk your way out of it if needed. In the worst case, they will ask for a show of funds to prove you can afford a ticket back.
Canadian Border patrol won't give you much trouble since they can check the system and see how far you are into your immigration process.
you can enter Canada in Vancouver, before getting COPR (than when you get it you can drive down to USA and back and do landing)