被灭火器砸烂的脸是假的。你仔细看，镜头一直晃动中，人有出框。在那里换上假的模型。

强暴戏份就是借位了。莫妮卡在地下道脸上的血是后期P的。还有，强暴戏中，有出现一个路人然后转身离开，那是真正的路人，不知道在拍电影，乱入，然后离开。

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在 IMDB Irreversible(2002) Trivia 中找到几个证据。

地下道中的强暴戏，莫妮卡和Jo共拍摄了六次，用了两晚的时间。莫妮卡说，第一次是最简单的，因为后面几次已经知道会发生什么，要防止记忆影响到她演的人物。

Monica BellucciandJo Prestiacompleted six takes of the rape scene over two nights. Bellucci claimed the first take was actually the easiest to do, since on subsequent takes she had a heightened awareness of what was going to happen and had to prevent this from interfering with her characterization.

Alex（莫妮卡在电影中人物的名字）脸上的血，和强暴戏中暴露出生殖器，是用电脑特效后期加上的，club中被砸烂的脸同样也是电脑特效。

The blood on Alex's face and the visible genitals of the rapist, both towards the end of the rape scene, were added digitally afterwards, as were the smashed-face effects in the club fight scene.

俱乐部中用灭火器砸烂人头的戏份，前面是演员，之后用乳胶人头替换。中间用特效衔接。

The man bludgeoned to death was a mix of an actor in the first few stages which was then substituted with a latex head. Digital effects were added to make the transition more convincing.

至于男主胳膊被反向折断应该也是特效。