Continuity mistake: While Ethel's looking at the Baby Pictures we see her fingernails are short and not polished, but in the closeup of her hand holding one of the photos the fingernails are long with dark polish.
Continuity mistake: When Lucy and Ricky are sitting on the coffee table looking through photos of Little Ricky, just as Lucy quips, "What magazine, body beautiful?" in the closeup the baby's photo orientation is portrait, but in the wideshots when Lucy looks at it and hands it to Ricky the orientation is landscape. (00:01:50)
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.