The broadcast of this episode on April 4, 1968 was interrupted by ABC during its original airing for news coverage of the assassination of Martin Luther King.
This is the third episode that featured the Stephens having a "what if" scenario. The first was What Every Young Man Should Know (1966) involved Samantha telling Darrin that she is a witch before they are married while the second If They Never Met (1968), depicted a world where Sam and Darrin never met.
It appears that the Stephens' bedroom was used as the Kravitz's living room here. You can see the diagonal door that was the Stephens' bathroom, then the bookcases where the windows were, then the door leading to the hallway.