21 Incredibly Obscure Marvel Movie Easter Eggs
13. Earth-616 - Thor: The Dark World
When Dr. Erik Selvig ends up in an insane asylum after being freed from Loki's mind control, he scrawls his scattered scientific theories on a conveniently-placed chalkboard, containing a number of references to the wider Marvel Comics universe.
The most iconic and interesting inclusion is the mention of the "616 Universe" just above Selvig's head, which is the typical designation for the core Marvel universe where the majority of the comic book stories take place (commonly referred to as "Earth-616").
It's worth noting that the MCU shouldn't be assumed to merely be a cinematic adaptation of the 616 Universe, but instead it actually has its own assigned classification: Earth-199999.
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