Lucy Becomes A Sculptress - S2-E20
Visible crew/equipment: When Fred steps down from the table hunched over and dressed in his long johns, he walks over to the edge of the couch, and there's an L-shape actor's mark on the floor where he stops and cracks a joke about bowling. Then later, when the art critic tries to lift Lucy's head from the table, more tape marks are visible on the floor. (00:18:15)
Answer: According to Snopes.com, there is no definitive answer, but the mid-1960s is the most verifiable date with "The Munsters" being cited as the first, although others claim "The Brady Bunch" showed the first couple seen in a double bed. An early TV show from the late 1940s titled, "Mary Kay and Johnny" is also thought to have shown the married couple's bedroom as having a double bed, although probably not with them in it. However, this was when TV was aired live, and there are no surviving episodes, only anecdotal accounts.
raywest ★
Something that is funny is that in the movie "A Christmas Story," they show the parents having two twin beds in their bedroom. In a real situation, they should have shown them having a double bed. Lucy and Ricky had twin beds pushed together in an early episode, which would have been pushing television boundaries in that time.