In the episode when Rachel and Harriette's father returns, Carl says that he bought the red wall unit in the back of the living room. But in this episode the red thing is already there before any of the Winslows stuff is in the house.
Carl says that he bought the house on March 8, 1976. But in episode #37, "Son", it is revealed that Carl and Harriette moved in right before Eddie was born, in 1974.
When they travel back in time to the living room the wallpaper is different and there is carpeting on the floor. In another episode, they flashback to the night Eddie was born in the living room, the night after they moved in. There is no carpeting on the floor and the walls are white.
The German episode title is "Der reichste Mann der Welt", meaning "The Richest Man in the World".
This is Mother Winslow's last episode until season 9. Due to her condition, she couldn't appear in as many episodes as she normally would have if she weren't aging.