I don't know about most states, but where I am, you can't get a job teaching a subject full time if you don't have an endorsement in it. At least, that's how I understand it. So how did Will even get the job? Unless it was an emergency teaching certificate, but then he'd have to be taking classes to get the endorsement, right? And, he'd already have to have at least some background?
I don't know. That bugged me the whole way through.