When the character called 'Stucky' goes to see Vivien at the hotel penthouse, knowing she is there alone, they are both sitting on the sofa and he strokes her leg suggesting he has sex with her, this causes her to lash out and they fight, as the arms flail between them take a good look and you will see his watch fly off his arm and go left across the screen,then she bites his wrist and as the scene quickly cuts to show her fall on the floor and him jumping up and back, yelling in pain and holding and looking at his wrist - hey presto - the watch is back on his wrist!