The hiring process is pretty basic, just like most retail operations. Basic personality tests and situation based questions. Nothing really hard about the process, save for the unprofessional nature of the interviewer.
The company is basically trying to figure out if you can work long unpredictable schedules and fill in for people when they don't show up, and whether you are willing to cross train and do a variety of jobs for essentially what is minimum wage rates. It is not necessarily a bad place to work, but these tactics in the hiring process sort of weeds out those who are potentially problematic.