This episode's writing credit reads "Paddy Fitz." This was one of many pseudonyms Patrick McGoohan used in writing, directing and producing most of the series himself. "Fitz" was borrowed from his mother's maiden name, Fitzpatrick. See more...
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Continuity: When No.2 is writing on the blackboard, in Question A. The capital letter "F" changes several times between the long shots and close ups. Also in Question B. The position of the first "T" in the word together also shifts position during the same shots, showing that the scene was filmed twice.