Factual error: The helicopter that was supposed to be used for the theft at the beginning is a Sikorsky S-76 and they said it would be useless because it can hold only a payload of 300kg. This helicopter can actually carry 1200kg or 12 passengers.
Factual error: The man in the security room, when watching the thermal video footage states that the thermal cameras needs a difference of ten degrees (or something like that), thermal cameras operate within a range of two degrees so it would have to be a fairly rubbish camera and that's unlikely, seeing how it's guarding a Monet and all.
Factual error: The Trojan horse is transported into the vault area by a motorised pallet jack. The pallet jack operator is behind the load and his forward vision is totally obstructed by the load. The operator should have been in the front (as required by OSHA). Also they must turn the load around in the narrow hall because later the operator is in the front.