In Up (2009) the color pink was used to represent Ellie. After her funeral, Carl returned to their house and pink slowly faded from the shot.
In Hercules (1997) when Hercules first walks into Phil's cabin he hits his head on the mast of the Argo. In the original myth, Jason, the captain of the Argo, was killed when the mast hit his head.
In The Incredibles (2004) Frozone isn’t using a pet name in the line “Honey, where’s my super suit?” - it’s his wife’s first name.
4The Little Mermaid
In 'The Little Mermaid' (1989) Ursula uses a butterfly (a symbol of transformation and mimicry) in the potion to transform herself into 'Vanessa' - which is a genus of butterfly.
In Coco when Miguel is about to cross the border to the land of the dead a skeleton that looks like Pablo Escobar is handing a small (possibly illegal) package to another skeleton who is about to cross the border.
In Aladdin, the Genie writes Aladdin’s order from right to left, which is how Arabic would be actually written.
In Pixar's 1995 Toy Story, the next launch timer in Pizza Planet is a count down until Woody lights the fuse on Buzz's Rocket in the end.
The dentist in 'Finding Nemo' (2003) emerges from the bathroom immediately after flushing and goes to work in his patient's mouth without washing his hands.
At the end of “Frozen”, Disney included a statement about Kristoff’s belief that all men eat their own boogers.
In Monster’s Inc (2001) Mike has 3 sticky note reminders to file his paperwork in his locker, which he later forgets to do, driving the plot of the movie.