Some of the buildings briefly featured are the embassies and legations of foreign countries. Legations were residences of ministers, whereas embassies are home to ambassadors. There were many legations, which were a "lower class" than embassies, in Washington, D.C. prior to WWII. However, by 1991 there were none left as all had been upgraded to embassies.
James A. FitzPatrick states that the cornerstone of the White House was laid in 1792, but the first president died before it was ready for occupancy. While technically accurate, this statement is misleading. George Washington, the first president, died in 1799. John Adams had succeeded Washington as U.S. President in 1798, and he and his family moved into the White House in 1800.