I suspect nothing special is on the teacher's edition 9.2.1 disc. I've got one of the 9.2.1 discs that was shipped along with the Mac OS X 10.2 sets to teachers for free several years ago and neither set of discs is anything special. They included a guide for getting started with OS X, and another disc of sample content and guide material (like text files and stuff you can manipulate and work with while following the guide) but nothing special other than that.
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