David Harbour at the "Stranger Things" season four premiere in Brooklyn, NY in May.Roy Rochlin/Getty ImagesDavid Harbour says the "Stranger Things" cast cried during the finale table read."Stranger Things" is currently in production on its fifth and final season.Harbour says he can be critical of the show — but that the final episode managed to "land the plane."David Harbour says that he can be one of "Stranger Things'" biggest critics — but in his book, the series finale is good.On Thursday, the actor appeared at New York Comic Con during a 10th anniversary celebration of Josh Horowitz's "Happy Sad Confused" podcast.