If "they" noticed the flag motion, why then publish it?
Good question, but with a good answer. In 1969, this was a 1-shot showing. People only got to see it once. So their "fixing of mistakes" only needed to be "easy" - no reason to reshoot everything or omit their "continuous footage" on account of something that probably not many would notice - and if they did - they'd be treated worse than HB's today... With no way to find a support group, etc...
Even today, lying or ignorant PNA's (Pro-NASA-Advocates) repeat the known-to-be-false claim that
"the flag only moves when being touched", but not daring to mention these critical exceptions. This lying claim is mainstream -- it's all most people will ever hear. They've been denied access to the true MLH arguments that undermine the "Apollo Truth" defined by the system for us today.
So clearly, this "fix" was good enough to last 55 years, and PNA's are still clinging to it tight. So it worked. That's why they didn't need to reshoot the scene or omit this footage.. Just "add a few photos" that we can point to later, if needed.
I haven't fully researched this one. Am in the process of doing this now.