Unfortunately, no. I think I came across a drabble once, but that's about it. There are some semi-canonical short stories written by Chabon himself--a booklet called "Untold Tales of Kavalier & Clay," which tells the story of Joe visiting Tommy's school (I'm not sure how you'd get your hands on a copy--Ebay?) and a deleted chapter called "Breakfast in the Wreck," which was published in the Virginia Quarterly Review and is now available only to subscribers, alas. There's also the comic book series The Amazing Adventures of the Escapist, but since I've never read it I can't really speak to its quality.
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Unfortunately, no. I think I came across a drabble once, but that's about it. There are some semi-canonical short stories written by Chabon himself--a booklet called "Untold Tales of Kavalier & Clay," which tells the story of Joe visiting Tommy's school (I'm not sure how you'd get your hands on a copy--Ebay?) and a deleted chapter called "Breakfast in the Wreck," which was published in the Virginia Quarterly Review and is now available only to subscribers, alas. There's also the comic book series The Amazing Adventures of the Escapist, but since I've never read it I can't really speak to its quality.