Corrected entry: There's a scene where two of the children are playing a video game. They're both holding controllers and talking as if they're both playing at the same time. But the game they're playing is "StarTropics" for the NES, which is a one-player only game.
Corrected entry: When Beethoven is pulling the two people, they seem stuck to the chairs. Wouldn't they have fallen off?
Correction: The game is Super Mario, and only the girl is holding an official NES controller the boy is using a makeshift gauntlet controller.