By the time the MCU ended its third phase, it had managed to release 23 films to form a cohesive story comprised of nearly all the elements that came before Avengers: Infinity War and Avengers: Endgame. Those movies worked off the ones that came before, but that doesn't mean there wasn't a ton of foreshadowing building up to the inevitable conclusion, pitting the Avengers, Guardians of the Galaxy, Wakandans, and more against the combined might of Thanos.
Some eagle-eyed observers noticed these bits of foreshadowing as well as those foretelling events in their own movies as the films were being released. Over time, more than a few folks had a good idea of what was coming with each successive MCU release. Fortunately, those viewers have shared their observances via the MovieDetails subreddit, making it possible to look back and have an "oh yeah" moment from any of these interesting examples.
Thor's Missing Eye Is Visually Foreshadowed
While fighting his older sister Hela, Thor sustained a critical injury after she slashed through his right eye. For those paying attention, there was some advanced notice, as Redditor u/uEAZYG247 pointed out:
The rubble left by the Asgardian mural in Thor: Ragnarok foreshadows the injury Thor receives later.Is this clever?
New Asgard Was Found Long Before It Was Settled
Odin's passing was an evocative scene, and because it was immediately followed by Hela's arrival, few fans noticed the foreshadowing like Redditor u/zanduby:
In Thor: Ragnarok (2017) before Odin dies in Norway, he points out to the distance and tells Thor and Loki, "Remember this place, home." This is where New Asgard is located in Endgame.Is this clever?
Thanos Alludes To His Own Eventual Defeat
Thanos was an interesting villain, and he wasn't without some interesting things to say. One comment in Infinity War foreshadowed the moment of his eventual loss, as noted by Redditor u/IamtheWil:
In Infinity War (2018), Thanos' opening monologue he says, "I know what it's like to lose.... Turns the legs to jelly." Later in Avengers: Endgame (2019) upon realizing his loss - the first thing Thanos does is take a seat.Is this clever?
Vision Is Created From Ultron After The Villain Says "Everyone Creates The Thing They Dread"
Ultron was an intelligent and ruthless villain, but he had quiet moments of contemplation. In one, he told something to Wanda that was noticed by Redditor u/JustANormalUser721:
Towards the beginning of the movie Ultron tells Wanda, "everyone creates the thing they dread." Ultron later begins to create Vision, a stronger form of himself, who plays a large role in Ultron's demise. (Avengers: Age of Ultron, 2015)Is this clever?