Brian Alvey at A List Apart says Everything I Need To Know About Web Design I Learned Watching Oz:

Learn to thrive within constraints The first thing new web designers usually figure out is that the web is all about compromise.

If they are coming from a print design background, they are handed a box of 216 crayons, a list of a half dozen available typefaces and a 72 dpi limit on image resolution. When the shock wears off and they get used to working within these web limitations, they encounter page weights, arbitrary standards support and CSS hacks.

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Don’t get too attached to anyone because they might not be around next week
I learned this one when I was working as a CTO in the twilight of the dot com years and our vendor contacts were changing almost daily.

When business was good, web developers would jump from company to company getting raise after raise. When business was bad, they would be pushed.

Luckily in Oz — and in real life — there has been a core group of characters that were all considered too important to be killed off