The British acting veterans are currently starring in a Broadway double bill of Harold Pinter's No Man's Land and Samuel Beckett's Waiting for Godot, and Stewart admits errors are inevitable during such a gruelling repertory act.
He tells the New York Daily News, "I do it (fluff my lines), but I don't worry about it. If it happens, it happens," while MCKellen reveals they have worked out a system to cover their mistakes, adding, "We share a look and work it out. Do a little improvisation and move on. It's inevitable in doing two plays."