Oh well, if you'd like something on a slightly larger scale here in the UK, I'll suggest Bombardier's construction of an entire fleet of Class 170 trains, used by rail operators across the country, which were powered by engines that were far too noisy. So they then spent a great deal of money improving the internal sound insulation on all of the trains, so that passengers were less bothered by the noise, only to find that platform staff were reporting the noise as a potential safety hazard because they couldn't hear messages sent over their radios. So the whole fleet had to be withdrawn from service for a second time in order to fit them with quieter engines.
Unfortunately Bombardier failed to take that opportunity to sort out a known problem with the sliding toilet doors, meaning that trains were returned to service with doors that would either trap passengers inside the toilets or, more frequently, open unexpectedly at particularly embarrassing moments!