For the documentary, which is focused on the murals that fill Belfast, the "Swingers" star interviewed Progressive Unionist Party leader David Ervine and Sinn Fein president Gerry Adams in front of several surprised locals, said the BBC.
The trio's discussion focused around a mural of famed Irish Republican Army hunger striker Kieran Doherty that appears on Belfast's Slemish Way.
"I was explaining to him that years ago we would not have a mural like this because it would all have been about politics and our divisions," said Ervine of his interview with the 36-year-old actor.
"I told him that, for me, the mural was the epitome of the change process that is going on in Northern Ireland," he added to the BBC. "The murals are changing."