They built comparatively poor QA into the design of the Saturn V. I've seen very revealing pictures of the bottom of the engine, where the exhaust leaves the combustion chamber on an F-1 engine. There was this kind of symmetrical bunch of holes, and one slightly dug in hole, maybe a quarter of an inch thick. A mistake. They had started drilling in the wrong spot and quickly stopped. That was a deviance, it was logged, but it was within spec.
That's Saturn V in a nutshell.