There is no on-call system for employees who don't come in, meaning staff are pushed to work harder to accommodate. In an assembly-like setting, missing people can ruin the shift. Animosity easily spreads, even though members try to stick together. Most workers who regularly come in are sweet and are the only way to get through the day. Make sure to speak Japanese or Mandarin if you care about not being left out of the job culture, though.
Workers spread illnesses to staff because they should not call in. Customers also see the sick workers coughing and sneezing near ingredients or when unpacking the cake. Not to mention the giant cockroaches in the staff room that sometimes came up into the store.
Advancement is impossible for most because of the limited number of management positions; you must wait for one to quit to have a chance. Most workers are visa/temp workers who will never be in line for promotion because they will leave.
Arriving for morning shifts or leaving night shifts sometimes means no subway access due to construction. Rotation shifts means no sleep schedule. Everyone always comments how "good" former employees look after they've quit...