I’ve said this before, change it to cover the 20th century and the incredible changes that occurred in the American home. Ideally I would add a scene to the show so that we could keep 1900, 1920, 1940 and then add a (July 20) 1969 and (Dec 31) 1999. However, that’s not going to happen so I would drop the 1920 scene, keep the 1900 and 1940 scene, add a scene of the family gathering to watch the moon landing, and then have one on New Years Eve 1999 (but still have the set decorated for Christmas, as Americans keep up their decorations through New Years.) I think those two events would cover important changes not only in the appliances (60s were a major move forward with the microwave and 60s chique, 1999 the computer obviously) but also for social changes.