The final line in both movies is "I think this is the beginning of a beautiful friendship."
There are 3 similiarities to the movie: There is only one sane person in the entire movie, one person tries to contact the U.S. President per payphone and the ending sequence with a lot of nuclear bombs exploding.
Osama bin Laden gets treated like a big star by his fellow Taliban, just like in this movie.
While on Letterman, Peter tells about his newest movie: a comedy about 9-11. The scene he describes is the infamous scene from "Postal" that made waves in early 2007 thanks to the New York Post.
discussing other works of Uwe Boll
Children getting shot scene from Postal is shown at one point
In the scene where Osama calls Bush via payphone, he ends the conversation with the quote "I wish I knew how to quit you"