Andy’s red string
The more Toy Story films that have been released, the more impressed we have become. Not only are the plots and characters fantastic, but the creators are also masters of continuity. They don’t overlook any of the previous installment details.
Do you recall how Andy’s arm was ripped off in Toy Story 2? In Toy Story 4, the red string he used to repair it is still visible, creating a toy version of a scar. So again, Pixar and Disney have done an excellent job.