While not addressing build quality, everything wasn't perfect on the home front.
As mentioned, wartime expansion brought a lot of new hires into the defense industry. I've read (I believe in Peter Bowers book
Boeing Aircraft since 1916) that the Seattle plant had trouble with some former "professional ladies of the night" who were hired. It seems they spent much of their time lining up moonlighting assignations instead of building B-17s. He doesn't say if the extra duty occurred on company property or after work.
It's a great topic, since you had car builders switching to aircraft and other new items, and many of the younger men in the workforce were off fighting so you had a lot of new-hires working. Again, I've read of Grumman building a aircraft (TBF or Wildcat) put together with cotter pins so the GM employees could learn about aircraft. Add to that factories where there was no history of large industrial plants, notably the Bell B-29 plant in Georgia, so a huge part of the workforce was new to the industry.
I've got to think somewhere there is a government (probably formerly classified) report addressing this topic, possibly done by a group like the well-known Truman Committee.
Also, it might be interesting if some of us in states that had large defense plants, contact state University history departments, perhaps a grad student has already done a thesis on this topic.
Last year on TCM there was a early wartime (40-42) film about some people who end up working at the Lockheed Burbank plant, while the personal stories were rather predictable (struggling would-be actress, young guy who wants to fly and his older immigrant dad) it did address some training issues and rather practical matters about a housing and transportation shortage...all with shots of the real plant and a few Hudsons. If anyone remembers the name, please share it.
Likewise, some history of industrial unrest has been pretty much swept under the carpet by folks wearing rose-colored glasses about the nation being totally united during the war years.