Time travel isn't realy possible. No time travel is accurate.

I think Tenet or Primer might be the closest to actually plausable. And they don't realy match what people think of as "Time Travel".

It didn't. It's a movie. They don't care.

There's a conversation between Banner and Rhodes while they're working on the time travel tech that's basically saying "anything we do in the past becomes the new cannon" as a massive handwave. It doesn't make sense at all, the writers know it, so they put that in as a not-so-subtle message to the audience to not take it seriously.

The scene where they reference other movies is just establishing the in-universe rules for time travel. Specifically, that when they time travel, they're actually traveling to a different branch of the "many worlds" tree of possibilities. This is a real theory that says that every time a quantum waveform collapses, what's actually happening is that the universe is splitting into multiple copies, one for each possible outcome, so that all the possible outcomes actually happen. So their time travel is actually finding a different universe that is identical to the one they want to travel to. The in-universe consequence of this is that, since they're going to a whole different universe, any changes made there don't affect the universe that they came from.

It's accurate in that the "many words" theory is a real (but unproven, possibly unfalsifiable) theory. It's not accurate in that there's no reason to think you could get from one universe to another. And maybe questionable that a universe identical to your own universe's past actually exists as one of the many words.

It's also internally inaccurate, since Steve Rogers travels to the past and then apparently just waits around to show up in the present again, which is exactly how they said it doesn't work.

https://youtu.be/WEgCvKdwNtA?t=60

There are two "possible" time travel scenarios:

• You go back in time and create a new timeline (Back to the future, ...) so you can't go back to your timeline.
• You go back in time and change the unique timeline (EG) so you memories change and whatever you changed it is now reality.

The difference is if the traveler is linked or not to the traveler's timeline. In the first case, the traveler is not linked and can change anything... But in the traveler's timeline nothing has changed and the travel didn't work.

In the second case, the traveler is linked and anything that changes because of the traveler is now that timeline reality and that can create a paradox. Imagine you go back and kill Trump when he was a kid. But you went back because you know the current Trump, the president. But of you kill him while he is a kid he won't become president and you won't know him so you won't travel back to kill him... so he will grow up and become the president and...

Multiverse, not to be confused with Multipass, which is something completely different.