Other mistake: In this episode one of the characters is seen to be driving a VW Golf. The scene is set in Geneva Switzerland. However an American spec VW Golf is used. Also in backround shots, American vehicles not avalible in Europe are seen. Another scene shows the police race past in two Skoda Rapides. This car has not been made since the early 90's and it is highly unlikely that the Swiss Police would be using these cars still. The shot is an old video that appears to have been shot in an Eastern European country.
Factual error: At Walter's apartment, Annie notices a group of spy novels on his shelf. The "spy novels" are actually six books from the Goosebumps series by R.L. Stein, The Day My Butt Went Psycho by Andy Griffiths, four books from Lemony Snicket's A Series of Unfortunate Events, and the British covered edition of Harry Potter and the Prisoner of Azkaban by J. K. Rowling.
Factual error: When Annie sends the text message to Auggie, you can hear the sound that is played when a message is sent, but you can see that it still says "Sending..." at the top of the screen, and the sound doesn't play until the progress bar fills up completely.
Factual error: Annie and Jacklyn are leaving the museum out the side exit (to try and avoid the bad guys), and Jacklyn uses her key card to open the door, just as the bad guys show up. They run through the door, and the door closes. The bad guys give chase, and open the door without using a pass key card.
Continuity mistake: In S3/E11, Rock and Roll Suicide, when Eyal throws a gas mask into Annie's prison cell, her hair is down but when she puts the gas mask on and exits the cell it is tied up in a knot. As they escape, she bends down over her unconscious captor and her hair is down again. When she stands back up, it is up again.