Unknown

Trivia: Throughout the movie if you look in the background at the various graffiti tags, one in particular stands out. Look for the tag OZ. In almost every scene that has graffiti on the walls you 'll see it somewhere in the background, sometimes more than once. Although it is common for graffiti artists to leave multiple marks in multiple areas, Berlin is a big city and it can be spotted too often for it to be coincidence.

Factual error: In the last scene the ICE Train is leaving the station eastbound. It is not possible to enter these trains at the central station because all eastbound trains end in Berlin and have only one station left (Berlin Ostbahnhof). Every ICE leaving Berlin is going in the other (westbound) direction.

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Dr. Martin Harris: They had me convinced that I was crazy. But when they came to take me, I knew.

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Question: What (if any) is the significance of the "OZ" graffiti that pops up throughout the film? It became quite distracting as I thought it would pay off at the end of the film.

Answer: The 'OZ' sprayer is a very disturbed man who claims to be an artist but the courts think otherwise. You can found his OZ (which he claims to be read OLI!) everywhere in Berlin and Hamburg. It has absolutely nothing to do with the movie but you can't film a wide open scene in Berlin without taping it.

Answer: Mise en scene. OZ / OLI is firstly a name. Asking what or rather who OZ / OLI is, is the point. One of the main questions of the film is what constitutes a person's identity.

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