Right around the 25-and-a-half minute mark, David Suchet (actor: Poirot) states that 'Poirot' is the only "Agatha Christie character" he has played. This is a slip of the tongue. Suchet portrayed 'Inspector Japp' in the 1985 TV teleplay of Thirteen At Dinner (4 years prior to taking on the 'Poirot' role himself).