I think the easter egg is when he says "Conditions could hardly be more ideal" because he kind of gives you a funny look right as he says it. He said the same thing in HL1 during the test chamber thing.
Hasn't Valve made enough money no Blue Shift, Opposing Force, and Counter-strike? I'd seriously doubt they'd charge so much for a game, not to mention MP. Which they won't, chill out.