2-point rule came from college football. Very few if any rules have went north to south. Again the yard markers on the field are only there because yardage in football makes a difference. But it doesn't matter if a first down takes 10 yards or 12, or 3. Its only because the amount of yards per play, matter. In rugby they make no difference. Most of the way Canadian football is played nowadays is influenced from American rules. Basically anything since the 1920s has been a rule change that made Canadian football more inline with American football. There is some style changes in American play now that may reflect Canadian football, but I'm not sure of any actual rule changes that make the game more "Canadian".