It's always this same scenario. NASA are amazing at constructing this hyper-unrealistic hoax to such extreme levels of intricacy but miss totally obvious things like this. It just doesn't make any logical sense.
MLH theory is that NASA was NOT awesome at creating a physics-correct simulation - but it was "Good enough", clearly as it's been 55 years.
NASA's main defense of this "flawed simulation" was:
1. that until post-2000, no one could easily obtain, replay, and analyze NASA photos, videos, PDF's, transcripts. Their simulation was "good enough" for the 1970's where you "saw it once" and done. And in that era of "celebrating success" to be a denier would be like standing up in a Fundamentalist Christian church and trying to convince the congregation that "the bible is flawed/corrupted" - no matter how strong your arguments, and how intelligent the congregation - they will disbelieve you, and you'll become the lonely object of scorn.
Additionally, if you were a denier -- it was near impossible back then to find others "like minded" -- all deniers operated in a lonely vacuum with NO SOURCES to question, as they couldn't view the photos, documents, nor video footage.
So pulling off the hoax, didn't require "physics perfection" - most mistakes would never be noticed -- until post-2000.
2. NASA made MANY mistakes... but only some of them are EASY TO PROVE. (this flag waving mistake is one of them)
3. The parts that were HARD TO FAKE-- NASA destroyed (or "Lost") - such as the entire set of Apollo source video footage and telemetry data! And 99%+ of the LM/AM design/tech documents!
This is the MLH theory. NASA messed up a lot -- but this was "GOOD ENOUGH" -- clearly.
Now, the defense of Apollo is shouldered mostly by Google/YouTube/etc - which classify MLH as Misinformation and so suppresses the pro-MLH articles/videos, except for the bad ones (like Sibrel, he's easy to find, and those who latch onto his flawed arguments end up looking like fools) -- so casually curious "very smart" people who dare to question Apollo - spend a few hours researching it, but the ONLY things they find are "Moon Hoax Debunked" articles and videos -- 100's of them. But Google/Youtube shows them NO LINKS to the good arguments. They spend a few hours, and thus become convinced that Moon Hoax believers also must think the world is flat, and are stupid.
Easy-peasy.