Major food manufacturing companies are worried about bits of metal ending up in cereal, granola bars, and yogurt. Lots of preventative maintenance is done on the machines to avoid pieces chipping off, but items are also inspected by high speed metal detectors as they are made.
You'd think this means any employee should avoid carrying around or wearing metal, just in case something like a button falls into production. But that's exactly what they do - make sure fasteners or easy-to-break-off items ARE made of metal. That way instead of losing a plastic button in a cup of yogurt, the metal button is easy to find.
What kinds of mistakes are you making that are hard to find? Can you make the mistakes more obvious?