Jon Stewart mentioned that someone misspoke and placed Omaha in Canada, but if he said who it was, I missed it. Google is no help with such a vague query. Any idea?
I hope Stewart didn’t think such a minor gaffe was worthy of a punchline.
Who’s Jon Stewart?
Where’s Omaha?
What’s Canada? “A few acres of snow that nobody cares about.” (Voltaire).
Jon Stewart is the host of The Daily Show on Comedy Central.
Omaha is in Nebraska.
You’re probably right about Canada, though. 
I got the impression that he was talking about something said during pre-show chatter between him and the audience, and I also got the impression, from the way he said it, that the one who made the gaffe was himself.