What a great post! I would love to read more of these for other films.

> Everything in the set was real. We couldn't fake any of it, because audiences are so sophisticated now in their knowledge of computers. > ... > - Cory Faucher (Special Effects Coordinator)

This sentiment seems to run throughout the movie, and I believe it's why it's held up so well in terms of visuals, I don't think it would have aged nearly as well as it has if more CGI (or other ways of "faking" things) had been been used.

As for the question (in <references[9]>):

> Some code associated with Nedryland is visible on screen. It looks like actual source code[9] with Classic Mac OS API functions calls.

That looks like old Pascal, and since the window has MPW (Macintosh Programmers Workshop) in the title, that's probably it?