In the extended conversation in bed between Hanna and her new friend, they are supposedly talking face-to-face because we see the back side of the other's head, however as the camera switches between them they are both shown lying on their left side making talking face-to-face impossible.
When Rachel is driving and talking to Hanna, the sun is outside Rachel's window but in the reverse shots the sun is outside Hanna's window as well.
When Hanna jumps in the river after the chase in the container yard, Isaacs is wearing his yellow jogging suit, without blood on it. When we next see him while Marissa is interrogating the family, he is flipping a section of steel pipe end over end in his hand, but his jogging suit is spattered with blood. All the family members are still alive, so where did the blood come from?
When Sophie refer to the two Spanish boys she fancies, the next shot shows the boys at a Foosball table. The immediate shot (without going back to Hanna and Sophie) shows them on opposite sides of the table.
When Marissa is returning fire through the door in the hotel room, the slide of her gun locks back, signifying an empty magazine. However, in subsequent shots, she continues to fire, even though she is never shown reloading her gun. (It appears that Marissa removes a spare magazine from her left jacket pocket.)
Hanna's cover story is that she lives in Germany, however she mispronounces the type of school she attends. In the German language, "Gymnasium" is said with a hard g ("guh"), rather than a soft g ("juh") as in English.
In the first shot at the CIA, there are two sets of flags, one U.S. and one other flag in each set. In one of the sets the U.S. flag is properly on its own right. In the other, the U.S. flag is on its own left - a serious breach of flag etiquette that the CIA would have been highly unlikely to have committed.
Hanna and Sophie lie on their sides in the tent, talking face to face. But in their respective close ups, both girls are lying with the left hand sides of their faces on the floor of the tent, and their right ears in the air, which means they can't be face to face. Sophie's close ups appear to have been flipped in editing for some reason.
After her escape from the CIA bunker, Hanna pops up in the desert. After observing vehicles passing over her, she somehow engages one vehicle's undercarriage to "catch a ride". In reality, the vehicles are passing fifty kilometers (thirty-one miles) per hour, and even if her reflexes were able to grasp, her wrists or shoulders would have been torn from their sockets.
Hanna was raised by her father, in isolation, near the Arctic Circle, intensely trained to be an assassin. In a close-up of Hanna she has pierced ears, it is unlikely from her upbringing that she would have this.
Having lived her entire life in a cabin in the Arctic forest with only her father for company, it's quite unrealistic that Hanna has shaved her legs.
When Hanna is talking to Rachel while Rachel is driving the van, the sun is outside Rachel's window but in the reverse shots the sun is outside Hanna's window as well.
The aircraft that Hanna sees flying over the cabin was a Lockheed C-130 Hercules. These aircraft have turboprop engines which use the exhaust of gas turbines to turn the propellers and that sound almost like a normal jet engines with a bit of a buzz from the propellers. The scene in question, however, clearly features the sound of piston engines.
When Hanna is escaping from the underground base she fires a gun and the slide locks open indicating that it is empty, but she is seen and heard to keep firing.
Erik decides to swim from Sweden to Denmark across the strait between them (Øresund), presumable to avoid border checks. But not only are both Denmark and Sweden (as well as Finland) members of the EU and also part of the Schengen Area, he could have traveled uninterrupted by land or sea from Finland to Denmark due to the Nordic Passport Union, using public transport. His method of entering seems a bit odd, as he later in the film arrives in Berlin by bus.
When Hanna arrives in Morocco, she is able to seamlessly communicate with the hotel owner in Arabic. Due to the high levels of Berber influence in Moroccan Arabic, it can actually be difficult to understand for speakers of standard Arabic, which Hanna likely would have been trained in.
The postcard Erik is reading has multiple faults in the address. First, the word for boarding house is written in an incorrect German, "Gaest Haus". In Danish it would have read "Gæstehus". Second, the name of the boarding house, which translates into English "The Beautiful Mermaid", has the last part of "mermaid" written in German ("fraue" instead of the Danish "frue"). Finally the postcode (zip code) is wrong, stating 8129, whereas it should have been 3140.
When Hanna first escapes the CIA base in Morocco, she is amazed at an electric light and overwhelmed by the boiling of an electric kettle. Yet a couple of days later, unaided, she can Google "DNA" and find out all about genetic engineering. Seems unlikely.
This is addressed in one of the deleted scenes which can be viewed on the DVD. When she walks into the internet café, she actually does receive assistance from an employee in how to use the computer.
This is addressed in one of the deleted scenes which can be viewed on the DVD. When she walks into the internet café, she actually does receive assistance from an employee in how to use the computer.
As Erik Heller leaves the cabin in the Arctic forest he is wearing a three piece suit. Why doesn't he wear his fur-coat instead? There is nobody near the cabin for miles. And he would be much easier to spot while wearing a suit.
Hanna has been trained to sound like an official document, rather than a plausible narrative that a lone teenager might give.