"Traditions of the Trade" mission - when Hitman is chatting up the receptionist, you can look in the guest book for Mr.Wuffs room. Also listed in the guest book are a number IO development team members. Martin Guldbaek and Rasmus Kjaer from the graphics...
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In Hitman: Codename 47 you get all maps if you call yourself "Kim Bo Kastekniv". The funny thing about it is that "Kim" and "Bo" are Danish names and "Kastekniv" means Throwingknife.
Developer Names in the Guestbook - 4.7/10 with 91 votes