Question: Spoiler! Given Gamora is brought to 2019 from 2014 with no ill effects, presumably just spinning off a new timeline with no Gamora in it (or Thanos for that matter, making that new timeline pretty peaceful), why can't the Avengers just go and "retrieve" alternate-timeline versions of the other people they've lost? They don't seem too worried about the timelines that have branched off due to their actions, eg. Cap going back in time (a whole other issue), Loki stealing the Tesseract, etc. They could hop back to a day earlier and basically get their friends back.
Question: Spider-Man: Far From Home shows that people snapped back after the "blip" come back in exactly the same place they disappeared from - mid-band performance, for example, and getting a basketball to the head as a result. Have the makers of either movie expanded on the ramifications of this? Because people snapped off a flight for example, might reappear mid-air...but with no plane, so plummet to their deaths.
Question: Why did 2014 Thanos bother to come to the future? As we are already aware, changing one time doesn't affect the other, and whether he knows that or not is sort of irrelevant. He could have stayed in 2014 and completed his mission, in fact he could have done it even more easily with the Pym particles he obtained without anyone ever knowing. He really had no reason to need to come forward in time. Knowing that Thor kills him in the future just means he could take steps to prevent that if/when it happens, he didn't need to act right then.
Question: Spoiler! Time seems to be defined as somewhat linear, with alternate realities branching off rather than changing the past of any given timeline. But if that's the case, how can Steve go back in time and stay, which should branch off a new reality with him in it, but then "catch up" with "our" reality? Seems like if he stayed in the past he'll have made plenty of changes.
Question: How did Tony know where to find the Tesseract?
Question: Why didn't Hulk use the Infinity Gauntlet to snap Thanos and his army? He was able to snap everybody that Thanos killed and survived, so he would have survived another snap.
Question: *Spoiler* After Tony died, why didn't anyone just use the time stone to bring him back? We saw Thanos do this with Vision in Infinity War so not sure what was stopping anyone from doing the same.
Question: The beginning of the film shows that Clint is still on house arrest. Ant-Man and the Wasp showed that Scott's house arrest ended well before the Snap. Aside from being sentenced at a later time than Scott, is there any reason why Clint would be given a longer house arrest than Scott? Wouldn't his time working for S.H.I.E.L.D. make it more likely that he would have got a more lenient sentence?
Question: When Hulk has the Infinity Gauntlet, Tony tells Hulk to snap back everybody that Thanos killed. Why not just snap Thanos and his army first and then snap half the world's population back to life? If Thanos had been snapped first, then they wouldn't have to worry about him anymore.
Question: At the end when Gamora and the Good Nebula are speaking, Gamora asks Nebula what happens in the future and Nebula responds that she tried to kill her many times, but they eventually became friends. Why didn't Nebula bother to tell Gamora that Thanos killed her to get the Soul Stone. Seems odd that she left that out.