 Everything in the episode had to be redesigned , which included new sets and all of the characters had to be remodeled for their age . In most cases , the adults were made heavier , had a few lines added to the face and less hair . On Homer , the redesign was minimal , making him a bit heavier , removing one hair and placing an extra line under the eye . Homer also wears a shirt like George Jetson 's . Krusty 's design is based on Groucho Marx . The night sky was intentionally made a more reddish color in a subtle joke about how the producers thought the world would be much more polluted in 2010 . Nancy Cartwright 's Bart voice was electronically lowered a couple of notches . 
