How’d They Get People to be in the Borat Movie?

From Slate:

Sacha Baron Cohen’s Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan is set to open in two weeks. The comedy follows a fictional Central Asian journalist who travels across the United States and interviews real people. Several of the film’s unsuspecting stars have come forward recently to say they got duped into participating in the mockumentary. Most say they never read the fine print on the release forms they signed. What kind of releases are they?