One of the most-talked about scenes in the Avengers: Endgame special look may not even be in the movie, if you choose to believe what the Russos said in an interview.
In an interview with Fox 5, the Russos were asked about the Tony/Cap handshake scene in the footage, and they claim it’s not even in the movie. Of course, the Russos also famously claimed that the Endgame title was not spoken in Avengers: Infinity War.
It’s also possible that the scene is in the movie, but Cap is wearing a different costume based on the set photos. Which would mean the scene, as it exists in the footage, doesn’t exist due to the digital alterations needed to hide what suit Cap is wearing. So what they said could be true, from a certain point of view.
You can see the Russos talk about that scene in the video below at the 5:27 mark: