If you pay close attention, Xenosaga has alot of references to stuff like that. ALso, a cool new E3 Video of XS has been released, and can be found at this site:

http://www.xenosaga.jp/c_a.html

There are two trailers, two commercials, and some wallpaper at the bottom of this webpage. The second last trailer, before the wallpaper, is the E3 Trailer, and it will also say E3 above the picture. Click view and you will watch it.