RE: Flaps or flaperons?
If you watch the video closely you will see he cuts the throttle on final and keeps the nose down until just above the end of the runway. In a cub this will keep quite a bit of excess airspeed and cause it to float down the runway until it can bleed off all that excess speed. Power should have been reduced on down wind, trim should be set to maintain a slow stable airspeed, and throttle used to maintain a good glide slope, and the plane should cross the end of the runway at about 5-10 feet