Psychonauts: E3 2002 trailer

In 2002, E3 showed a trailer for Psychonauts. But since Psychonauts wasn’t avalible until 2005, there are many things in the trailer that differ from the actual videogame. Also, when the trailer goes through showing main characters, Lili is never shown. Is it possible that she was not a character that got created right away? I’m only asking this because she is my favorite character. :)