The 400-pound safe is about twice as tall than it is wide. When it is dropped on its face onto the crawler, the crawler wheels are smashed and makes the crawler and the safe immobile. When the forklift smashes into the office, scoops up the safe and withdraws from the office with the safe on the fork, the safe has been turned 90 degrees to fit comfortably onto the two fork prongs even though the two men still in the office could not possibly have shifted the safe 90 degrees.
When the heist is discussed, in a wide shot Norman Fell is resting his chin on his fist. In cuts to close ups of Norman Fell his hand is out of the shot.
A radio announcement states that a man contaminated by cobalt radiation who was shot at the Long Island Emergency Hospital had two accomplices for the theft of the cobalt device. How would they know that, since Al Norman (Norman Fell) died from the gunshots.
They wore masks during the heist when they tied up the guards so the guards could have counted that there were three of them.