Seasons 1–5 utilized a more invasive laugh track; a more subdued audience was employed for Seasons 6–11 when the series shifted from sitcom to comedy-drama with the departure of Gelbart and Reynolds. Several episodes ("O.R.", "The Bus", "Quo Vadis, Captain Chandler?", "The Interview", "Point of View", and "Dreams" among them) omitted the laugh track altogether; as did almost all of Season 11, including the 135-minute series finale, "Goodbye, Farewell and Amen". The laugh track is also omitted from some international and syndicated airings of the show; on one occasion during an airing on BBC2, the laugh track was accidentally left on, and viewers expressed their displeasure, an apology from the network for the "technical difficulty" was later released, as during its original run on BBC2 in the UK, it was shown without the laugh track. UK DVD critics speak poorly of the laugh track, stating "canned laughter is intrusive at the best of times, but with a programme like "M*A*S*H", it's downright unbearable."