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Not every waving flag needs a breeze -- at least not in space. When astronauts were planting the flagpole they rotated it back and forth to better penetrate the lunar soil (anyone who's set a blunt tent-post will know how this works). So of course the flag waved! Unfurling a piece of rolled-up cloth with stored angular momentum will naturally result in waves and ripples -- no breeze required!
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I've seen a lot of the footage you are referring to in your post and I agree; when the astronauts are fiddling with the flag, it should move.
The case in my links is different though. The flag is not moving and when the astronaut merely walks by it the wind created by his movement causes the flag to move.
Your post didn't address this particular case if the flag moving. It addressed different cases of the flag moving.