Actually, he's making fun of Americans. He used and abused their good nature to, through Michael Moore caliber editing, make them look like fools.
It’s a strung together bunch of practical jokes. An old gambit. David Letterman made a career out of it. Remember ‘Candid Camera’?
Were there not lawsuits for defamation of character involved as well? Don’t quote me, but I’m quite certain some people he filmed did indeed sue for not being told they were going to be in a motion picture.