This one must have come to TV pretty early (I guess a lot of Hammers did), because I remember seeing it a very short time later. Apart from the inflated shoes and balloons, I remember one thing about it, and that's the "spoiled brat" teenaged ruler of the place, and that's for a very odd reason. One of the castaways defies him by saying he's a ruler who "can't wipe his own backside" on his own. It's the first time I heard that particular bit of hyperbole (at least on TV), and it's always been one of my least favorite ones! (In an escapist story like this one, do I really need one of those scat expressions?!)