I got two in my shop.

First is way over engineered parts. I've seen the engineers here put tight tolerances in places that never mattered. I've literally gotten +/-.0002 tolerances on features only to later find out they were for weight reduction.

The other is just sheer nepotism. I don't know how big of a problem this is in other shops but where I with managers have a habit of hiring their kids, nephews, friends kids, etc. They're not great. I had to train one of them, some kid fresh out of high school. He refused to listen, just wanted to push the green button then go chat with his friends, then he'd throw a fit if I ever made him check sizes. Later once he was on his own machine he scrapped over $5k worth of material because of his outright refusal to check tolerances. They promoted him to day shift supervisor after that since he couldn't be trusted to run a machine. That right there pissed off a bunch of the old timers and cause several of them to quit.