Easter eggs in Marvel movies are almost as much fun as the movies themselves. True to form, there is no shortage of hidden things in Thor: Ragnarok taken straight from the Thor comics, and then some. Not only does the God of Thunder's long history get a ton of nods in the movie, but so does the Emerald Avenger. In fact, one of Hulk's greatest storylines is adapted for this film – despite the fact that his name isn't even on it!
These easter eggs in Thor: Ragnarok are sure to keep you intrigued until the next Marvel release. While some are pretty well known, others are so obscure you might have never heard of them. Beware, there are Hulk-size spoilers for Thor: Ragnarok in this list. If you haven't seen it yet, feel free to peruse the easter eggs of another recent MCU installment, Spider-Man: Homecoming, instead.
The Eternal Flame is the source of Surtur the fire demon's power, and in Thor: Ragnarok it is made clear that the fire has been taken from Muspelheim and rests in Odin's vault. Surtur must reunite with the fire (his crown in the movie, but his sword in the comics) to gain his true power.
The fact that it is in Asgard, however, means something else. In the comics, Odin's father, King Bor, sent his three sons to Muspelheim to defeat Surtur by stealing the source of his power. Odin was the only son to survive and returned with the Eternal Flame, leaving him the only heir to the throne. It would seem that his origin story is the same in Thor: Ragnarok, or at least the presence of the Eternal Flame in Asgard hints as much.
Thor calls his ragtag group of Sakaaran outlaws the Revengers. While it's not particularly original (as he's clearly just ripping off the Avengers), a team called the Revengers actually does have a place in Marvel lore.
One reality in the Marvel Universe is called "The Cancerverse," so named because Death was overcome. That leaves undead versions of beings to roam the Earth, including zombie Avengers called the Revengers.
When Thor makes his triumphant return to Asgard, he finds Loki masquerading as Odin and basking in the adoration of their people. Thor sees through the ruse immediately and thinks of a clever, yet brutal, way to make Loki reveal himself. He grabs Odin/Loki's head and summons Mjolnir, the implication being, "Come clean or your face is toast." The gambit works: the false king steps out of Mjolnir's path just in time and reveals his true identity.
This isn't the first time the God of Thunder has done this, at least not in the comics. In Thor #359, Thor does the exact same thing to Loki, forcing the God of Mischief to remove a spell he'd cast upon his brother.
The Grandmaster calls his gladiatorial competition the "Contest of Champions," something the Grandmaster indeed participates in in the comics. He oversees a Contest of Champions against Death in a 1982 storyline, in which the two immortal beings pick their own Marvel champions with the Collector's fate on the line.