When Gemma is in the cell, Unser and Stahl enter and Unser unlocks the cell door, Gemma then pulls it shut and you hear the sound of a latch engaging. In the wide shot from inside the cell you can clearly see daylight down the edge of the cell door and there is no locking mechanism.
Jimmy O congratulates Putlova on "excellent work" when he examines the fake ID provided by Putlova, but the close-up shot of the bank cards, passports and visas shows that Jimmy, Putlova and Putlova's forgers didn't pay attention. The bank cards are in the name of William Elder, but the two visas are in the name of Elder Williams. Not exactly "excellent work", not for seven hundred thousand dollars.