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The author does mention this possibility in one of the final paragraphs, that maybe every actor in the film /except/ Julia Roberts and Bruce Willis look different in the Ocean's 12 universe - it seems to be what the film wants the audience to think, and though it's a bit silly, so are the films :)

The author is someone I wouldn't like to have a discussion with at a party, because he insists if one character looks like the real actor in that movie, then every other character must have their actor doppelganger in that universe...

Keeping reading. The author explains the implications of this not being true.

On a sober note it could also be put down to Willis’ future aphasia.