Julia Roberts and Drew Barrymore worked for a scale salary of $250,000 as a favor to their friend, director George Clooney. Brad Pitt and Matt Damon did cameos for free.
Sam Rockwell met with the real Chuck Barris and got him to read out his lines so he would have a record of Barris' style of delivery.
The clip from the The Newlywed Game (1966) is a real clip and it's actually from an episode that first aired in 1977. It was long thought to be an urban legend and at one time even the host, Bob Eubanks, came to believe it was not real.