Do you keep your insurance on until the buyer fully transfers the ownership? My broker says I should have it on until they do. If something happens while it's still under my name, it will come back to me... Doesn't really make sense to me but that's what he says.
You used to be able to call/go to the MTO and ask for the car to be put under a sold status, that way there's a sold flag on it even if the new owner didn't register yet.