The Fridge Brilliance that sets in after Bowler Hat Guy reveals that Cornelius Robinson, this brilliant, successful, world-famous inventor/industrialist/patriarch of the amazing and loving Robinson family, is Lewis' future self. You realize: Oh my, this is Lewis' future if he doesn't give up, and what's even better, he builds it himself.Anvilicious as it is, it works.
Cornelius showing Lewis around his lab and pointing out his favorite invention, the same one Lewis entered in the science fair and which won him his new family. Tom Selleck nails it to the wall.
The final scene with Wilbur. He finally fills his end of the bargain and takes Lewis to see his mother from the night she left him in the orphanage, even if it means that he'll be risking his existence again.
Wilbur: I never knew my dad could be my best friend.
Lewis saying goodbye to the Robinsons... for now.
The ending quote, revealing the origin of the Arc Words.
Around here, however, we don't look backwards for very long. We keep moving forward, opening up new doors and doing new things, because we're curious... and curiosity keeps leading us down new paths. — Walt Disney