The Odd Couple (Randall/Klugman version) began as a single camera show with a laugh track. They aired an episode without the laugh track, and Randall/Klugman came on at the end and asked the audience to mail in their opinions. That mail ran against the laugh track. They decided to make a change, but as Mary Tyler Moore and All in the Family were proving very popular with live audiences, The Odd Couple went that way instead of single camera/no laughs. This was being worked out in 1971, and MASH debuted in the fall of 1972.