I am currently working an engineering job doing wire harnesses for heavy trucks. Last year, I was working on global products, and we were going into pilot builds for a truck with ECE (Europe) requirements, which is really only relevant because we had to completely redo the turn signal wiring. When we finally built the trucks that were production-intent, they test the trucks, we cause zero line downtime, we pass all electrical tests, but....the turn signals were reversed.
One print error made four months earlier and and our lights are blinking in the wrong direction. The good news is that it was an easy fix on the trucks we built, but I still shake my head at how we missed that detail.