I don't see any plants in this crowd.
From the video's commentary:
"A bumpkin from flyover country might think that New Yorkers were booing al-Qaeda that's bent on destroying their city. FACT: Islamic radicals would be more welcome on the Upper West Side than American patriots."
Given the welcome Columbia University gave to Ahmadinejad, I would correct that "would be" to "are."
The video was made by The People's Cube, whose members I knew during the 2004 election, when they went by the satirical name Communists for Kerry. Their founding members are emigrés from the Soviet Union who remember what it was like to live under Communism.