It's not the manufacturing mistake. It's how you deal with it.
Similar to my profession - aircraft maintenance. It's inevitable that mechanics will break things on airplanes. Breaking something on an airplane won't get you fired. What will get you fired is hiding the fact that you broke something. If you break something, just own up to it so it can get fixed properly.
With OEMs, some handle poor designs or manufacturing defects better than others.
An example of a poor design that was handled improperly was the PowerShift dual-clutch automatic transmission used in a lot of Foci and Fiestas from 2011-2016. They knew of the problems with the design, and pushed it through anyway, leaving the buyers holding the bag.
An example of a defect that was handled right was the Toyota Tacoma frames from the mid-2000s that were improperly coated by supplier Hino, many of which began to severely corrode, prematurely. In that case, Toyota offered to inspect customers' frames, for free, even outside the anti-corrosion warranty, and would swap the truck onto a new frame if severe rust was found. I have a 2007 Tacoma, and received a letter several years ago, instructing me to take the truck to a dealer for inspection. I did so, and luckily no bad rust was found (I've owned since new and the truck has always resided here in Tennessee).
