When you read the title "HowardCantour.com," you've already experienced most of Shia's contribution to the project. The only other alterations were things like changing the bagels the characters eat into cookies. That's the level of cinematic insight Shia brings to a creative project: liking cookies.
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"I go to my death shamed by association."
He also changed a mention of Le Mepris to Shakespeare in Love, because he doesn't think a lifelong professional film critic would have heard of one of the most famous French movies ever made. No, he's really changing it because he thinks you're too stupid to know anything outside of Hollywood. It's possible he doesn't even know there is an outside of Hollywood and thought the original comic had a typo. Children have copied from Wikipedia 10 minutes before the school bus arrived and put in more original work, because they change some words other than the proper nouns. He couldn't have taken from Clowes more publicly, obviously, and brutally without cloning him and beating the result to death on stage.