For Spider-Man: Into the Spider-Verse, Every Cool Surprise You Can Imagine Was Considered 

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“Meanwhile in another universe.” Those four words at the end of Venom may have changed everything when it comes to Spider-Man movies. By shifting out of Venom’s universe and showing a scene from Spider-Man: Into the Spider-Verse, the filmmakers and studio made it abundantly clear that Venom and Into the Spider-Verse

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https://io9.gizmodo.com/for-spider-man-into-the-spider-verse-every-cool-surpr-1830893467