Corrected entry: It would be impossible for Robert DeNiro to blow the door off of the safe in the fashion he has chosen. Safe doors are secondarily unlocked (after the combination is presented) by turning an exterior handle that release the bolts that secure the door when it's closed. Because this mechanism was not engaged, and the bolts were not released, the door is still in its strongest state. And the bolts are not apparent on the removed door that falls to the floor, nor is the special glass insert that makes the safe door undrillable.
Corrected entry: In the scene where De Niro is putting all of his stuff in the trunk of the old beater he sometimes drives, you can clearly see part of the crew behind his head to the left WAY in the background of the parking garage.
Corrected entry: In the scene where Robert de Niro blows the door of the safe, the safe door (which is several inches, with big bolts) is blown across the room. But the fragile aluminium boxes inside are not affected by the explosion at all.