5. Everything in The Collector's trophy room (Guardians of the Galaxy)

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The Collector's part in Guardians of the Galaxy is short but sweet. The highlight is definitely his trophy room, which is filled with rare specimens he's amassed from across the galaxy. For our purposes, it's an easter egg goldmine. Almost every single thing in a glass case is a snarky reference to another movie or an especially obscure piece of comics history.

One of the easy ones is a dark elf, just behind this pink gal below. The dark elves were the bad guys in Thor 2; they're more or less evil versions of Dobby from Harry Potter, minus the burlap sack.

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There might be another Thor villain in the collection, as this fogged-over cube looks as though it could contain a frost giant. 

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If you look behind Rocket, you'll recognize a chitauri, one of the many Skeletorish aliens that descended on New York at the end of the first Avengers movie. 

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This adorable dog in the space suit just so happens to be a major player in the Marvel Comics universe. 

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Cosmo is not just a Russian cosmonaut dog, but he's also a powerful telepath. If Marvel's smart enough to include him in Guardians of the Galaxy 2, this guy is going to give Rocket a run for his money.

Then there's this giant cocoon, which holds not a Starship Trooper bug but instead a beautiful disco wizard by the name of Adam Warlock. He dates back to the old Thor days, and has since become a big deal in Marvel's cosmic sector. Warlock was a also key player in the original Infinity Gauntlet comics, so it seems likely that this cocoon will be empty by the time we get to the Avengers: Infinity War movies.

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But Benicio Del Collectorio doesn't exclusively collect Marvel aliens -- in one scene you can spot these little slug critters, which hail from the Nathan Fillion horror/comedy Slither. It makes sense, given that Guardians director James Gunn also worked on that movie.

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This may be a stretch, but some believe that this thing way in the back is an honest-to-goodness NASA space outfit. It would appear as though the Collector nabbed himself a human astronaut.   

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It was easy to spot Howard the Duck in the post-credits scene, but you can actually catch him in the movie proper, tucked way in the back. 

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Before you start asking for another Howard the Duck movie, it's a good idea to remember what the last one was like.