Here is an interesting comparison of Cortana over the course of the 4 halo games:
PTesh adds his dulcet prepubescent tones over the top of one of the new trailers for weapons...
Try upgrading your browser to Google chrome (you wont regret it). There is probably an IE...
Legendary Jason Jones Cardboard Cutout
Level: Uprising (Campaign Clip)
When playing on Legendary during the cutscene where the grunts are confronting the brutes the camera shows a grunt holding up a cardboard cutout of Jason Jones. This same egg appears in Halo 3 as the "Jason Jones Floating Cardboard Cutout" Easter Egg. It seems Jason himself or someone else at Bungie is a hobbyist exhibitionist when it comes to Jason's programmers tan.