Goofs

On the film poster Tarek is wearing number 82, but in the film he is number 77.

At the end of the movie the Elvis Presley imitator gets knocked down and attached to a prison cell with handcuffs. But after that he suddenly is on the loose.

After the car crash in the beginning of the film, the right rear of the taxi has been damaged, including the rear light. When Tarek drives Dora to his place, it's just the other way around.

When Tarek is being carried to the black box, his glasses are shown to be lying horizontally on the floor, aiming at the cells. Later the glasses are shown leaning against a cell door, aiming at Schütte in his chair.

Tarek's eyeglasses continually disappear and reappear without any apparent reason.

Some prisoners (such as Tarek at 1h35m) can be seen in underwear, although they were not allowed to bring it in.

Tarek's eyeglasses: the receiver (masked as walkman) has a 100m range. But where was it during the experiment? The locker rooms were too far (thick walls would absorb the rays).