Jarrett had a script on his prompter referring to lines forming at a Palin appearance, somebody did indeed switch the video for old B-roll without fixing the script, and Jarrett adjusted.
Now Josh, the I'm-going-to-be-a-reporter-someday crew member, and Michael, the I-really-want-to-be-a-rock-star prompter operator, were around me, wearing the same expression you'd have after witnessing a car wreck.