WSJ has an extended excerpt from Stephen Baker's Final Jeopardy: Man vs. Machine and the Quest to Know Everything.
... Right before the lunch break, one clue read, "The inspiration for this title object in a novel and a 1957 movie actually spanned the Mae Khlung." Now, it would be reasonable for a computer to miss "The Bridge Over the River Kwai," especially since the actual river has a different name. Perhaps Watson had trouble understanding the sentence, which was convoluted, even for humans. But how did the computer land upon its outlandish response, "What is Kafka?" Mr. Ferrucci didn't know. Those things happened, but Watson still won the two morning matches.
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