Devastating, heartbreaking, and the title is ironic
There are so many conversations on this board that are trying to make this movie into some kind of Hitchcockian thriller. It's like the overanalytical comments during the televised book discussion that Georges hosted in the movie. The movie isn't a thriller, it's about colonialism, privilege, and not being able to see what's right in front of your nose. Also about the cluelessness and paranoia of oppressors who accuse the less privileged of ruining society.
Georges tells Anne he thinks he knows who's stalking them, then he refuses to say who. He is clueless that there is anything at all wrong with this. He is incapable of putting himself into her shoes to see why this could drive her crazy. Then he tells HER, "Do you realize how crazy you sound?" Later he apologizes to her again. She says,"You think that makes everything OK?" It's like trying to atone for centuries of genocide by saying, *beep* happens." His attitude is, life goes on and what can you do about it? Yes, life goes on. People slit their own throats all the time, don't they.
Georges stumbles out into the street between two parked cars without looking, then accuses the black cyclist of running into him.
Georges' mother wanted to adopt Majid, which Georges made sure did not happen. He deliberately ruined Majid's life. Majid grew up in a French orphanage for Albanians, who were treated like dirt. When Georges goes to Majid's flat for the first time, he sees a small, cramped low-income hovel. That was the life Majid was consigned to and he could never hope for anything better. George has no idea that he had anything to do with that. In George's mind, that's where Majid belongs. Majid says to him, "You haven't changed a bit." In other words, Georges once was and still is a sadist who can do whatever he wants and has no idea he's hurting anybody, just like when they were kids and George accusing Magid of killing the bird to scare HIM. Paranioa, self-absorption, clulessness. Just like all the rest of the entitled of the earth.
Majid's son said to Georges, "Go ahead, hit me. You're stronger than me." The same words Majid used when Georges first came to Majid's flat.
Georges has no idea how unbearable Majid's life is now that Georges has had him and his son arrested for kidnapping Pierrot. But there was no kidnapping, Pierrot just couldn't stand being at home any more. Georges has now ruined not only Majid's life but Majid's son's life as well, but he continues to think THEY'RE the guilty ones.
Why is the title ironic? Nothing is hidden, it's all right in front of your nose, but no one wants to see it. Or acts like it's nonexistent. Just keep staring at your nice piece of Parisian real estate to remind yourself that all is well.
Pierrot, the son, isn't having any. When he gets home after everyone thought he was kidnapped, remember how he wants nothing to do with his mother and pushes her away? She's part of the cluelesness. She'll just continue to hide and pretend it's all OK. He's given up on them. The blood-spewing drawing is trying to say, "Don't you see what you're doing to people?"
There's a scene at the beginning in the kitchen where Anne is setting the table and you only see her from behind. It's the point of view of an awkwardly placed camera, like a hidden camera. Pierrot made the tapes and the drawing. Or maybe Majid's son did, or maybe they did it together, or maybe they had someone else do it. It doesn't matter. They see what's hidden, what no one else can bear to face. All that happens in the final shot is you see Majid's son crossing the screen below the steps of the school. That's the revelation: Majid's son is at Pierrot's school -- they know each other. Somehow they found each other and have uncovered the truth.
There are some user reviews of this movie on IMDB that say all this much better than I did, one in particular that was posted 16 May 2005.
p.s. One of the most amazing things about this movie is that it didn't occur to me till days after seeing it that Daniel Auteuil, one of my favorite actors for decades, actually was not Georges. :)