Corrected entry: It's not really a mistake but when Rachel is our running and she asks Frank to walk with her, if you look in the background, there are 2 "ghosts" walking hand in hand behind them.
Corrected entry: Rachel's and Sy's idea to perform at the Mayan took Frank by surprise. Later, when the situation escalates, he makes his escape though a secret side door (not the "official" back exit where he sends Tony), where earlier he had directed the driver with the limo. As he hadn't even heard of the club before and as he had no chance to check it out while they were there it's not quite clear how he acquired this detailed knowledge of the location.
Corrected entry: In one of the opening scenes when Frank returns home from his first assignment in the film, he finds his front stoop covered with mail and newspapers which have accumulated during his absence. It is unlikely that a security professional of his stature would not cancel his deliveries or arrange to have it collected by a neighbor/friend.
Corrected entry: There's a certain inconsistency about Rachel's popularity. Earlier in the movie some admirers recognize her in the street in spite of her sunglasses and ask for autographs and to be photographed with her. A little later just the announcement that she would show up in the Mayan makes people go crazy inside and outside the club. But in the date scene nobody in the bar even glances at her, the totally undisguised Academy Award nominee.
Corrected entry: Frank introduces himself on the intercom at Rachel's gate as Alexander Graham Bell, but the limo driver asks him why he called himself Thomas Edison.
Corrected entry: In the scene where Kevin Costner takes Whitney to his home following their date, he throws Whitney's silk scarf up in the air in order to demonstrate the samuarai sword's sharpness. However, as he throws the scarf in the air, it touches the sword and is not cut; it is only as it falls back down that the scarf is cut in half.