Coming from the webapp world: How do you work with a team of people committing to the same repository? How do you review code? How do you find solutions to problems when they're not being spoon-fed to you in a bootcamp? What makes an application reliable? Well-designed? Scalable? When should something be improved upon, and when should it be chucked and rewritten? How can an application be hacked? How do you design DB schemas, and query them efficiently?
These are the sorts of things you implicitly trust a developer to know. The bootcamp students I've seen fail to realize that these are even issues, and get a big wake-up call to when they come up short in their first job. As a result, they struggle at the lowest rung in the ladder, as their coworkers cannot trust them to do any reliable work.