Go to the end of the film were the family is watching TV in the living room. The news comes on and the news anchor begins by talking about how Richard Nixon has resigned.
The film takes place in Washington DC, yet the news clip shown is from Canadian television (Global Television News in Toronto, Ontario). The news anchor is canadian journalist Mike Anscombe.
This is either an easter egg (most of the film was shot, and post-produced in Toronto), or the editors couldn't get their hands on any newsreels from one of the big three american networks.