Following up on Fox News' use of 2008 Palin campaign rally footage to depict what the network described as “huge crowds” attending Palin's current book tour, The Chicago Tribune's Swamp blog reports:

“This was a production error in which the copy editor changed a script and didn't alert the control room to update the video,'' Michael Clemente, senior vice president of news at FOX, sad this evening. ”There will be an on-air explanation during Happening Now on Thursday."