An N rating is for necrophilia. The film is Waltz with Bashir and necrophilia refers to sexual arousal from dead bodies. The movie is nearly all animation except for the gratuitous addition of dead bodies from color newsreel footage at the end. The footage is awful, I wish I hadn't seen it. It deserves an N rating and a warning on the theater marquis. If you don't like close-ups of dead bodies avoid this movie.
Whether the film is anti-Israel is hard to determine. I saw it with a famous Israeli dramatist. We all came away wondering who could understand it. The European anti-Semites who financed it would see it as anti-Jew. Anyone who doesn't know who the Christian Phalangists were will find it anti-Israel. The rest of us just wonder what the film was about.