Robert DeNiro
With all the nods towards "Taxi Driver" in a post featured elsewhere on this board, I'm surprised that no mentioned the fact that Bob DeNiro makes a cameo in the movie. In the scene where the female news reporter interviews John's character outside the theater, the guy that emerges from her car and first steps up to John's character is none other than Robert DeNiro.
-Charles W. Bailey
http://www.imdb.com/name/nm2351682/