For the record, Farrell lends both those begrimed teeth and some serious tattoos to the part of the wide - eyed, pro-Stalinist Valka, and the actor's zombified,
unhinged theatrics are met in differing ways by Sturgess's indomitable, rather dully noble Janusz («just keep walking» is his mantra) and Harris's wild - haired American, Mr Smith, who takes concepts of expatriation to a new extreme.