In the Simpson house some of the rooms are in a different place, placing the kitchen where the back yard door is now, and a small window, in what is now the kitchen entrance. Of course, this is before they established the look of the home.
At the beginning of the episode, when Homer searches for his keys, Marge's pearls are white instead of red.
The second time Homer and Bart are playing video games, there's a shot where Bart's controller doesn't have a wire.
Lisa's progress report says that she "refuses to play dodge ball because she is sad." That sport is typically spelled "dodgeball," as it is a compound word, not two words.
The second time Homer and Bart are playing video games, there is a shot of Homer mashing away at his controller, however the button is on the opposite side from his thumb.
The front door of the house has a skeleton lock but if you look closely Homer's key isn't a skeleton key.