For this accident, no one cut any corners. The T.O. sucked, it wasn't a job that was done often, it was a turn over, their was no follow-on MX requirements, the pilot missed that his stabs/ailerons moved in the wrong directions, the crew chief missed the same during the launch, the pilot missed it again at EOR, and that dick general wanted to make an example of those two because they were enlisted and expendable.
Too many people missed the problem. The moment QA got the split tail about the possibility of crossing the flight controls at the mixer assembly, before this job took place, the first hole in the cheese fell into place.