Lots of levels of management -- several that don't have the ability to lead. Expect your job training to be slow and not engaging. With the number of managers, it takes forever to get things approved, or you just get told no. Lots of red tape in many different processes.
Open floor plan is extremely counter-productive. It's loud, with people talking on cellphones while wandering around the floor, playing video games, etc.
Your manager sits in the open floor plan with you, so if you need to talk, it's almost impossible, without an awkward trip to a meeting room.
Lots of talk of layoffs -- it seems like it's become "normal". The company also has a tendency to over-hire, then reduce workforce shortly after. Turnaround causes all sorts of disasters -- new management, new senior team members -- not many have a clue what is going on.