This article contains NO SPOILERS for Thor: Ragnarok that aren't in the SDCC trailer.
Kevin Feige has revealed what he believes is the biggest Easter egg in Thor: Ragnarok - and director Taika Waititi has thrown his own thoughts into the ring. Right from when a mock-up of Captain America's shield turned up in Tony's lab in Iron Man, background references have been an essential part of every Marvel Cinematic Universe movie, with clues to the future and nods to the comics aplenty.
Thor: Ragnarok comes at a pivotal time for the MCU. The mega-culmination event Avengers: Infinity War is less than a year away, and the God of Thunder is leaving the glistening home of Asgard for more overtly sci-fi lands like Sakaar. There's a lot of room for cool Easter eggs, and now Kevin Feige's said what his favorites are.
Speaking at the Thor: Ragnarok junket press conference where Screen Rant was in attendance, the super producer said that the biggest Easter eggs in the film are the heads of previous gladiatorial champions on the side of the Grandmaster's Sakaar palace:
"There might be some things in the trash piles. I mean, the biggest - the biggest Easter eggs are on the side of the Sakaran Palace - right, Taika? There are - there are previous Grandmaster champions that we see, as one for Hulk is being constructed, and those are all sort of Easter eggs for the deeper comic universe - that may or may not ever show up in the cinematic universe, but we thought it’d be fun to celebrate."
Feige doesn't say explicitly what these Easter eggs are of, but as this building is seen in the marketing (it's the opening shot of the official trailer), fans have already done the digging. These heads have been concluded to be of Beta Ray Bill (top left), Ares (top right), Bi-Beast (bottom right) and Man-Thing (top). The bottom left and bottom heads are still debated (although some believe the latter is Fin Fang Foom). While this isn't any of those characters appearing proper, it does confirm they exist in the universe (or did at some point). Whether they'll turn up in future MCU movies Feige is coy about, likely because the Cosmic future after Phase 3 is still being mapped out.
After Feige's answer, Taika Waititi jumped into detail his own, literal Easter egg:
"And in the trash pile, there is one Easter egg, an actual egg. If you were in - yeah, I mean, it’s - it’s one of the small ones - well, it’s one of the tiny little chocolate ones, and it’s the wide shot."
The director is most likely joking - he's not one to avoid trolling the press in a conference - although his commitment to the bit is sure to have fans scouring the film's wide shots of Sakaar to find any chocolatey clues.
Of course, while Feige singles out the busts as his biggest Easter egg (and Waititi a Mini Egg), both of these are spoiler-lite and already known by many. It will be interesting to see what other secrets emerge once Thor: Ragnarok is on general release in a couple of weeks.