When Sam is showing George Washington the map in the den, she mentions "Washington, DC" as the nation's capital. George should've corrected her, as the nation's capital was Philadelphia during Washington's presidency. It was moved to Washington, DC in May 1800 - five months after George Washington died.
As "General" George Washington vanishes back to his time, Darrin and Samantha enter The Den. Behind them, there no longer is a doorway to the kitchen.
A picture and wall-papered wall are where the doorway was for 8-years.
A picture and wall-papered wall are where the doorway was for 8-years.
The Kitchen doorway opposite the Den's Doorway disappeared in this episode. The Doorway is walled off behind Darrin and Samantha who entered the Den to find George and Martha Washington.