Random Huge Plot Holes In 'Avengers: Endgame' (11 items)

(#1) How Does Steve Rogers Turn The Space Stone Back Into A Tesseract?

When Steve Rogers and Tony Stark travel back in time to grab the Space Stone, it's still in the form of the Tesseract. By the time it makes it to the present day, they've reduced it down to just the stone so it can fit on the new Infinity Gauntlet for Hulk.

But at the end of the movie, Rogers is supposed to return the Stones to the exact moment they were taken. That should be easy enough, except the Space Stone is still just a stone. How is he supposed to turn it back into a Tesseract? That seems like it'd make a pretty massive difference in the timelines if the Tesseract magically turned into a pure Space Stone for no apparent reason.
(#4) What Has Captain America Been Doing For The Last 70 Years?

The biggest issue with Captain America deciding to travel back in time to get some quality time with his sweetheart in the 1940s is that he apparently never decided to help out with the world’s problems again.

Think about it: from 1940-something to 2023, Captain America apparently does nothing except putter around the house during moments of crisis like Vietnam, 9/11, and basically every bad thing that's happened since WWII. If he had intervened somehow, surely S.H.I.E.L.D. (who is actually HYDRA, remember) would know about it and would find a way to keep tabs on him. Instead, they still believe the "real" Captain America is frozen on ice or otherwise lost to time for decades.

Evidently, Steve Rogers manages to hang up the shield and “get a life” while watching the world go to hell around him.
(#8) Shouldn't Our World Now Be Overrun With Darkness?

When Bruce Banner attempts to convince the Ancient One to give up the Time Stone, she tells him that if they lose the Time Stone, Earth - and maybe all of existence - is basically screwed. She says if he takes the stone, it'll create a new reality and "in this new branch reality... our world will be overrun, millions would suffer." Bruce assures her that it's fine, and they'll bring the Time Stone right back, thereby preventing an alternate reality.

And that's all well and good, but by the end of Endgame, Thanos (presumably) still wipes out all the Infinity Stones - including the Time Stone. This means that, at least according to the Ancient One, the future is doomed without the Time Stone. Just because it took an extra nine years for the Stone to be removed from reality doesn't suddenly mean there are no more forces of darkness.
(#9) Why Did They Jump To 1970 For Pym Particles?

After losing the Space Stone in 2012, Steve Rogers and Tony Stark decide to travel back in time to a point when there’s both more Pym Particles (so they can jump through time again) and a less guarded Space Stone. To that end, they jump back to 1970.

But why would they need to go that far back? Pym Particles presumably exist from 1970 until Thanos’s snap in 2018. Pym’s alive that whole time, and surely he’s got particles with him in storage. There's no time constraint to worry about since they already plan on jumping back to the moment in 2023 when all three teams leave. In fact, it’d probably be easiest to just jump back a few hours in 2012 to grab the briefcase again before Loki can get it and then go to San Francisco to ask Hank Pym for some help.
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Marvel Encyclopedia, New Edition with Introduction by Stan Lee

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(#11) Before Becoming A Supervillain, Was Obadiah Stane An Actor?

If The Big Lebowski exists in the Marvel Cinematic Universe (Tony Stark calls Thor "Lebowski"), then that means Jeff Bridges exists in the MCU. Except we already know Jeff Bridges played the villain Obadiah Stane in the first Iron Man.

So, is "Jeff Bridges" really just the stage name for a brilliant but evil industrialist who works with Tony?