Roman Pearce: You know, I think I make a better special agent than you ever did.
Brian O'Conner: I guess that depends on how you define 'special'.
During the vault chase scene, the vault spins on two separate occasions, tangling the lines in the process. The first time, it is being dragged out of the police station and the second when it destroys half a bank. The lines could not have been untangled, because both times they guys were turning to the right and the vault spins in the same direction.