Juergen takes the cyanide out of a paper package, kept in a coffee container. Over time, and it had to be years he kept it, potassium cyanide reacts with CO2 and moisture in the air to become harmless potassium carbonate. It has to be kept in sealed, water and gas tight containers, like glass capsules etc. to avoid this.
The passport inspection scene at the airport shows that the film is set in November 2010. The entire film shows German Police cars as being green-silver in color and Police uniforms as green-beige. However, in 2010 the State Police of Berlin had started switching the color of uniforms to blue and the color of Police cars to silver-blue. Due to the amount of Police officers/cars involved in the story, at least some should have had the new color scheme.
After the pickup at the airport, the taxi driver is speaking, apparently on the phone. According to the closed captioning, this is described as "cab driver speaking German". The driver is actually speaking Turkish.
Jurgen tells Harris that Stasi agents were taught that an innocent man always stuck to his version of truth while a liar reformulated his ideas. Actually, Stasi doctrine taught the exact opposite: a liar has invented a pre-programmed version of the facts and cannot change it, while someone innocent knows how to reformulate his speech and does it.
After Liz puts the USB drive into Professor Bressler's computer she completely closes the zipper of the computer bag. However, in the next shot of the bag, it is partially open, revealing the USB drive.
When Gina steals the cab at the airport, she has to back off to a different road, and we can see that the Mercedes has only one backup light working (the right one). However, a few minutes later, when she is ramming the van in the parking garage, she backs off, and both of the backup lights are working perfectly.
After the taxi goes off the bridge and Gina swims out she is shown breaking out the back window of the taxi. The next scene shows the inside and small pieces of glass falling through the water around Dr. Harris. When Gina swims/reaches inside the taxi there is no glass left at all from the rear window in-spite of the fact that there would be shards left around the edges held in place by the rubber.
When Martin Harris receives the phone number noted on a piece of paper from the nurse, and when he checks it again inside the phone booth, the hands holding the paper are clearly not Liam Neeson's hands (size and nail shape rather different at these close-ups from the scenes with Neeson's face and hands together at the same frame).
When Gina phones up Martin Harris to warn him of Martin B turning up to the exhibition, she can't get through to him on the phone but the operator message received is in English when the film is set in Berlin and it therefore should have been in German.
When Martin Harris is going back to the airport, he takes a cab from Adlon Kempinski in the middle of the city. Tegel, the airport, is in the north-west. And somehow they end up on the bridge by Warschauer Strasse, which is way out east.
When Martin Harris and wife take a taxi from the airport to the Adlon Hotel, you see the Soviet War Memorial, then they pass the Victory Column towards West. This is near the Tiergarten. However, they are traveling a direction away from the hotel. The hotel is behind them. After they passed the Victory Column you see the Brandenburger Tor. However, the Brandenburger Tor is to the East of the Victory Column and the Soviet War Memorial is between Victory Column and Brandenburger Tor.
After Dr. Harris is pulled from the river and the EMTs are working on him they use a defibrillator on him to attempt to revive him. This is totally inaccurate, as he is covered in water, lying in water, and the EMTs are standing/kneeling in water while using a powerful electrical current. Had this been real then not only would the current have passed through Dr. Harris's entire body but the bodies of the EMTs working on him. Something that anyone familiar with the use of a defibrillator well knows hence the warning "clear" called when ever it is used.
The Saudi prince is named 'Shada' which is not an Arabian name for men nor is it for women. The name has no meaning at all in the Arabic language. There is, however, a feminine name close to it, which is (Shatha).
When Harris asks the hotel security head to contact the US Embassy, he is told it is Thanksgiving and the Embassy would be closed till Monday. This is nonsense as all major embassies have duty officer(s). In real life, Harris would have been able to contact the Embassy and have his identity confirmed through passport and social security records.
When Martin is rolled off the MRI scanner by the assassin, he is put onto a gurney with metal rails and the nurse has a pair of scissors in her top pocket, both of which would have been pulled into the strong magnetic field of the scanner.
During the car chase scene, we hear engines revving and cars flying through streets at break-neck speeds. In one shot, Harris is glancing at the speedometer and we see a shot of the dashboard with the speedometer climbing above 60. However, this being Berlin, the speedometer would be in km/h, hence 60 is actually a leisurely urban-appropriate speed.
The security officer of the Hotel Adlon tells Harris that the American Embassy is closed due to Thanksgiving. True; there is, however, a consular officer on call after hours and on holidays for emergencies like this one. (The officer could have been deliberately lying.)
After the hotel explosion, the view pans down on a damaged and burning building with firemen spraying it with water, yet, when it pans down to the crowd below the view changes to a fireman feeding a very obviously empty fire-hose up the firetruck ladder when it's in use.
At the end of the movie, Harris and Gina get onto an ICE train which then leaves Berlin Hauptbahnhof (Central Station) from the east side. ICE trains leaving the east side of the station only stop once more (in Berlin itself) before being cleaned for the next trip. ICE trains leaving Berlin Central Station for long-distance destinations always leave from the west side.
When Jürgen takes cyanide, he correctly stays alive long enough to finish his conversation with Cole. Despite cyanide being a very rapidly acting poison manifesting within minutes, the first signs should have been stupor and apnea followed by convulsions.