I was watching the special "A Leg up for Christmas" and although I have seen this many times, this time I noticed something odd, you need to watch the part when they first take Howard to build him up, Foggy tells Compo to stand on his head, which he does against the stone walling, that is the part you need to watch as Compo heads for the wall, then we see his feet sticking up from the other side of the wall.