Sony's Spider-Man: Into the Spider-Verse has even more cameos, references, and Easter eggs than its predecessor, and many are subtle or brief enough that they're easy to miss. While 2018's Into the Spider-Verse saw a handful of Spider-People travel to Miles Morales' reality after he's bitten by the spider that gives him superpowers, Across the Spider-Verse inverts that premise. Miles goes on an interdimensional adventure that sees him cross paths with the hundreds of similarly powered individuals that make up Miguel O'Hara's Spider Society.
https://screenrant.com/spider-verse-deep-cut-references-cameos/