So it was said that there was one last hidden Easter egg within the cosmic Marvel movie, Guardians of the Galaxy.
I hope you remember the rumor that Taneleer Tivan was holding Beta Ray Bill in one of his containment boxes. From this little picture.
WARNING: This is just a theory. So please bear with me.
I believe that this is Thor.
This is my belief, because back when the title for the third Thor installment was released. Thor Ragnarok. (Ragnarok is in fact the apocalypse tale of Norse Mythology) It was said that at the end of the movie, Thor would be "imprisoned". Therefore wouldn't be seen again until Avengers: Infinity War Part II.
Now I know for those of you who has seen Avengers: Age of Ultron. You're thinking, "but the power gem was shown. How could Thor possibly be imprisoned there if he saw it in his vision?"
The power gem (the orb), could have activated itself. Much like how the tesseract activated itself to transport Loki. This gave away its location to the universe. (To Thanos, Taneleer, even show up in Thor's vision) Thus, while the beginning of the Guardians of the Galaxy time period. Asgard and our mighty son of Odin, will have suffered its peril and casted Thor into the confinement of The Collector.
Again, this is all just a theory I came up with. Only James Gunn knows the final Easter egg.