These pop quizzes are always so educational for me. I should do them more often so I'm grounded as to changing visitor competencies and frame of reference. It's possible there's a myriad of issues but I was looking for the broadest, most obvious and most costly considering the potentiality for error. From a sewing perspective, that'd be the notches. Someone in a sewing line would never have occasion to see the pattern and know whether there were a grain line or not. It's the notching that's noticeable from a sewing perspective. Grain line or lack of one, is only obvious from a cutting perspective.
In the previous entry, there's no way to tell which piece goes where. In industrial sewing, notching is coded and offset. Anyone, anywhere should be able to pick up a cut piece and know instantly whether it's a back or a front piece regardless of whether they know what the garment looks like. It might not matter if you're only sewing one at home. It matters a great deal if you're sewing whole stacks of these. Then you'll become very annoyed.
The system of offsetting notches was discussed at length in the production pattern making section of my book (pp.176-180) precisely because this is one of those little things that is never mentioned in textbooks and it really matters. This explains why it's easy for a practitioner to know at a glance whether they're looking at a home pattern that's been put on oak tag or if the pattern maker is a little green. In industry, notching isn't considered to be arbitrary. I know pattern books seem to stick them where ever with no rhyme or reason but that'll get you in hot water at work. Below is just one possibility; of the side front (SF) being sewn to the center back (CB):
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