The lamp in the living room shifts position during the final fadeout scene.
According to the book, Adam Newlarkin's ancestor had been cursed 300 years before.
The third part of the cure to remove the curse from Adam Newlarkin required him to ride through the market square "like Paul Revere".
There is a hand visible to close the door when Samantha and Adam come home from the bank. This happens in several episodes to make sure that the door closes properly.