Marvel Studios broke new ground in cinematic storytelling when it took the continuity driven model behind comic books and brought it into the movie theater. The way the various films have connected to each other, have made the MCU the biggest film franchise in the world and recently made Avengers: Endgame the biggest box office movie in history.
However, continuity can be a tricky thing. There are a lot of things to get right and movies frequently get called out when they make a mistake. While the MCU may be getting all the broad strokes right, it turns out it's letting some of the smaller details falter. Somebody recently discovered an error with Tony Stark's elevator as it is seen in Avengers versus how it was seen more recently in Avengers: Endgame.
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In Marvel's The Avengers, known as Avengers Assemble in some other countries. Agent Coulson hijacks Tony Stark's elevator in Stark Tower at the beginning of the movie in order to talk to Stark about the Avengers Initiative following the theft of the Tesseract. He's seen here in the top of the two images shared to imgur, getting out of the elevator, with simple wood paneling and a horizontal metal crossbar.
In Avengers: Endgame, we get a scene that is set not more than a couple of days after this scene. The Battle of New York is over and the Avengers are victorious. The team is taking Loki,down to hand him over to S.H.I.E.L.D. and they pile into the same elevator, except this time we see a few differences. The interior wall of the elevator is quite different as is some of the set around it
This is, of course, the smallest of details. It's hardly important. It's actually more shocking that somebody discovered the difference than it is that the error was made. Enough of the set looks similar to make it pretty clear this is supposed to be the same elevator, but enough is different that it's clear that Endgame missed the mark.
The crew of Avengers: Endgame almost certainly spent a lot of time looking at The Avengers in order to properly recreate the necessary scenes in Endgame. Knowing that it is a bit surprising that this piece is off. Considering how much of the film was created in a computer, it seems like, if rebuilding the set to look exactly like the earlier film wasn't an option, the changes could have been made via CGI.
This is what happens when the highest grossing movie in the world comes out on Blu-ray. People pour over it ways you likely never expected. This isn't the only continuity issue that Avengers: Endgame has. When you're making a three hour long epic that's a culmination of a decade's worth of movies, you're likely going to miss a few things here and there.
