Some interesting stuff.
nytimes.com
>Real life physicists consulted on the movie’s time travel elements and they are in agreement that the Back to the Future is wrong.
>Smart Hulk was supposed to happen during the Battle of Wakanda in Infinity War, but it did not feel right to have Banner have an up when everybody else was down. They really struggled with how to present it in Endgame and wrote several drafts with “lab scenes” showing how Bruce did before ultimately deciding to just jump right into and use Ant-Man as an audience surrogate in “WTF is going on?”
>They left Hawkeye out of Infinity War because they felt “leaving his family to fight” was too much of a retread of his Civil War arc. The scene of his family being dusted was also planned for Infinity War to show the global effect of the snap, but the Russos decided it undermined the urgency of what was going on in Wakanda.
>They originally planned for Thor to be on a “mssion of vengeance” in Endgame, but felt that was just retreading old ground and decided to instead completely drive Thor up the wall by making him a fat drunk. They consider the post-snap state of all survivors a worst-case-scenario type of “What If…?” story.
>The Living Tribunal was going to appear during the Battle of Titan in Infinity War but everyone thought he was too out there without proper context.
>They were reluctant to revisit The Avengers because it seemed “too pander-y”. There were drafts where they would get both the Aether and the Tesseract from The Dark World-era Asgard. Stark would go there in a stealth suit that makes him invisible, but Heimdall would be able to see him and they would fight; Thor and Jane Foster would have a long conversation.
>There were drafts where they would go to The Winter Soldier-era Triskelion, and then someone would steal a car to go to the Sanctum Sanctorum.