Well there lies the flaw in the plot. Because Number 6, to whom Alison-Number 24 is alluding, is wearing a cream blazer with black piping. And the man in the photograph is wearing a dark blazer with off white piping! Of course the production crew and cast have not taken into account this change of coloured blazer in the scene, and still remain faithful to that of the original script which called for a dark blazer.
One other observation. McGoohan, who has undergone conditioning to make him left handed, has not taken this left-handedness into account. He still wears his stainless steel wrist watch on his left wrist, when of course, being left handed, should have been worn on his right wrist!
Be seeing you