Astronomy has come a long way
Remember how the Fates tell Hades what will happen in 18 years if he releases the Titans while the planets are aligned in Hercules? You may have noticed that only six planets are depicted in the sky; this isn’t by accident.
Only Mercury, Venus, Earth, Mars, Jupiter, and Saturn had been named at the time, therefore the writers left out a few planets to authentically depict Ancient Greece’s conception of the solar system.
Someone has a sharp eye
It is not commonplace for animation companies to “recycle” scenes from previous films; most of the time, consumers are unaware of the connection, making this a cost-effective method of saving time and money.
A seven-year-old boy who was watching Up at home realized he had seen this moment previously, and we were impressed to find that he had recognized it from another film. His mother paused the movie and snapped a picture of the scene, and they were able to locate the same sequence in Cars 2.