Revealing mistake: In almost every episode where Michelle is a toddler, you can always see her look to the right or left to most likely a person telling her what to do.
Revealing mistake: When the robot refuses to let Paul and Barry through, they attempt to go under his arms but they are thrown aside. It is obvious dummies are used, because of their floppy features and blank faces.
Revealing mistake: The "hostage" episode reuses footage from the "Dinosaur" episode, which doesn't totally fit. When the giant crabs attack and destroy the group of houses on the island, the longshot of the damage is recycled from the earthquake episode - including an earth fissure, something the giant crabs wouldn't and probably couldn't have done.