Marvel Cinematic Universe: Definitive Guide To Easter Eggs, In-Jokes And Foreshadowing

Guardians Of The Galaxy

12. The Infinity Stones

We already got some vague information on them in Thor: The Dark World, but now Infinity Stones are properly elaborated on and their origin explained - they were six singularities that pre-date the creation of the universe formed into ingots.

11. The Celestials

As Tivan states, the Infinity Stones can only be wielded by immensely powerful beings. The example he uses are the Celestials, giants who are seen destroying a planet. This isn't the first mention of a Celestial - this scene is taking place inside a the head of dead one (that's why Knowhere looks like a skull - it is).

10. The Power Stone

It is in The Collector scene when it's revealed that the Orb contains one of the Infinity Stones, confirmed by James Gunn to be the Power Stone. This means that, as the MCU currently stands, there's been four of the stones introduced - the Tesseract in Asgard, the Sceptre in Hyrda's base, the Aether in The Collector's museum and the Orb, at the end Guardians Of The Galaxy on Xandar.

9. Slither Reference

It's not just Marvel Easter eggs in the Collector's museum; James Gunn also uses it as an opportunity to throw in a nod to his first film, Slither; the slug-like monsters from that film are in a case seen prominently in the seen.

8. A Dark Elf

Rounding off the background cameos in The Collector's museum is a Dark Elf from Thor: The Dark World.