During the sequence where Ego reveals the true extent of Peter’s abilities — and following the exchange where Peter claims he’s going to build all kind of “cool sh*t,” including recreations of Pac-Man, Skeletor, and Heather Locklear — Star-Lord literally sees stars when Ego shows him the limits of the galaxy, prompting Peter to whisper “Eternity” in awe of what he’s seeing. It’s hard to say for sure, but this seems to be a nod to the all-powerful being of the same name, as Eternity is frequently depicted as an entity made up of stars and planets.
https://comicvine.gamespot.com/eternity/4005-11332/ Source: ComicVine
7. Ego’s Plan
To the surprise of many, we actually get to see Ego’s Living Planet form in the film, face and all. However, what’s really interesting about Ego is that his plan to take over the galaxy is pretty much the inversion of The Stranger’s plan from the comics. In that storyline, The Stranger tries to destroy Ego by putting him into a large bio-verse called Super-Ego and it’s actually Ego who needs saving, with his fellow Celestials coming to his aid.
6. Family Cameos
In the very first scene of the original Guardians of the Galaxy, we briefly meet Peter Quill’s grandfather (played by Gregg Henry), who comforts his grandson by Meredith Quill’s hospital bed. Surprisingly, Henry’s character actually has a cameo in Vol. 2! During the sequence where Ego activates his seeding pods, the one he left in Missouri starts a path of destruction. When the pod is finally stopped, it just narrowly destroys a car and in that car is Quill’s grandfather.
In another cool bit of cameo placement, the old couple who wonder out loud what the heck the giant blob that almost killed them is are none other than Jim Gunn Sr. and Leotta Gunn, parents of James Gunn and his brother Sean, who returns as Yondu’s Ravager ally Kraglin (and the on-set Rocket Raccoon!).
http://marvelcinematicuniverse.wikia.com/wiki/Peter_Quill%27s_Grandfather Source: MCU Wiki
5. Other Cameos
Guardians of the Galaxy Vol. 2 features a number of cameos, with two in particular that are almost non-existent and yet are performed by pretty famous people. The first is Rob Zombie, who actually had a cameo as the voice of an alien in the first movie. Here, he’s billed as “Unseen Ravager,” which seems to be an accurate description as it seems like no one has been able to spot him. The other noteworthy cameo is Nathan Fillion, who was cast as Simon Williams AKA Wonder Man, but unfortunately, his role was cut from the final film. We didn’t think it was possible to cut Fillion from anything, but here we are.
http://screenrant.com/guardians-of-the-galaxy-2-rob-zombie/ Source: ScreenRant