Cameos, in-jokes, re-used animation and other trivia from Incredibles 2.
- Spencer Fox, Dash Parr's original voice actor, could not reprise his role because his voice had deepened in the intervening years, leading them to cast an actor appropriate for a 10-year-old character, so Fox was replaced by Huck Milner.
- Bud Luckey, who voiced Rick Dicker in the original film, would not reprise his role in the sequel, with Jonathan Banks voicing the character instead. Luckey passed away one month after the announcement due to an extended illness, implying that said illness was the reason for his recasting.
- In the trailer, the Chinese food container looks just like the one used in A Bug's Life and Inside Out.