Well, games in the United States never spell their words with British spelling..
So should there be two English versions of the game, or should the world just all switch to US English?
One of the silliest things I ever saw was an Australian movie on DVD, with an English dub. <img src="/ubbthreads/images/graemlins/silly.gif" alt="" />
EDIT:
The movie was the special edition of Mad Max. On the back of the DVD;
New-To-The-U.S.! Original Australian Language
...
AUSTRALIAN ENGLISH: 5.1 Surround & Mono; ENGLISH DUBBED: Mono
English, French and Spanish Language Subtitles