Continuity mistake: When Peter O'Toole is locked in the closet at the museum, he puts a rope through the keyhole and uses a hook to pull it under the door. In the first shot, from outside the closet, the end of the rope is to the right. In the next shot, from inside the closet, the end of the rope slides under the door to the left. (01:22:30)
Continuity mistake: When the senior guard speaks to "his Excellency" and decides to turn off the alarm, he reaches to his pocket to produce the key. However, in the moments when the telephone rings and he walks to the phone, the key was left in the alarm vault door.
Continuity mistake: When Audrey is scrubbing the museum and attempting to escape to the guard room and notices the large engagement ring and removes it from her hand, the very next scene where she is scrubbing the pillar and holding the bucket shows the ring still on her finger. The ring catches a flashing reflection as the camera pans away.