Slow to respond to complaints, Gaslight you when you do.
They keep the place chronically understaffed. This means that the flexibility in scheduling they usually have gets tossed to the side and may schedule in hours you’re unavailable.
Constantly calling you on your personal days off.
Make promises that things will get better and months later it will be the same understaffed, hectic, overworked conditions. These conditions make fellow coworkers disillusioned and don’t care about the job and only a few people end up doing a majority of the work and things get left not done.