A Supercub has really crap viz above and behind, and not particularly good ahead, either! one has to lower the nose from time to time when climbing, for example.
We have here three high wing aircraft with the same rough configuration and consequently the same problems of limited viz above and behind, to say nothing of descending without a good look where you are going. Two were engaged in banner towing, one engaged in arial photography. It is usual in banner towing that only one pilot is on board; though the Cessna seemed to have two up. It is mandatory for any aircraft filming that there are two aboard, one to fly the airplane - and maintain lookout, the other to worry about the photo shoot.
I see no reason why the Dutch authorities should not place a requirement on banner towing activity that could bring some order to the parade along the beachfront; we manage it nicely in Florida and New Jersey.
Question arises, who took that photo of all three planes?????