Factual error: The gadget Ash gets Shaun to hide inside the bank vault deposit box is essentially a large and extremely powerful electromagnet. An electromagnet powerful enough to support a grown woman's weight (which it does later in the episode, when Emma uses it) would require significant power: either from a mains supply of electricity (which isn't possible, given the device is locked inside a deposit box), or else from batteries far larger than what could fit inside the gadget as shown on screen.
Character mistake: Ash Morgan tells the grifters that "Anxious" has a basement flat in Camden, and he sends Sean there to get phoney identity papers. It is quite clear that the flat is on the ground floor, not in a basement. The front door opens onto the street.
