Lucy Changes Her Mind - S2-E14
Visible crew/equipment: When Ricky begins to talk to Ethel about the night they all went out to dinner, it cuts to the start of his flashback and it's a closeup of Ricky sitting on the couch calling out to Lucy, and as the camera pulls back into a wideshot we see the shadow of the moving camera/equipment. (00:01:15)
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.
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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.