In the instances in question, it's clear that Rumsfeld is finished talking. He's not gonna say anything more unless asked another question. So I really think Morris is mostly trying to goad that creepy smile out of him.

MPAA says "for sexuality and drug use." Manheim's character is a pothead but it's not like we see her toking up constantly (nor is she a child). There are some fairly vulgar insults directed at Madsen, so maybe that's what did it. Can't remember anything else. No nudity, certainly no violence.