The team of agents that inspect Crown's house emerge from a truck that displays the false company name "Aladdin Cleaning Services". However, the company name is misspelled on the agents' jackets, reading "Alladin".
The scene where hundreds of men in bowler-hats cause confusion, carrying with them copies of a painting depicting a business man with an apple obstructing his face, Michael McCann incorrectly calls the painting the Man in the Bowler Hat, a painting by René Magritte. The painting is in-fact The Son of Man, a similar painting by the same artist.
Catherine Banning, whilst picking holes in the investigating detectives theory, says that "the thieves prepared a load, conservatively, 1,000 lbs of paintings and 800lbs of men that we know about in a chopper with a 600lbs useful load", suggesting that this could never happen.The chopper is then correctly described as a Sikorsky S-76. However, there are four men on the job in total (800lbs), plus the load which is stated to weigh the equivalent of five men (1,000lbs). Add the helicopter pilot and you have the equivalent weight therefore of 10 men. Yet the S76 is a 12 man helicopter so should easily cope with this much weight. Catherine's figure refers to the baggage compartment capacity. They'd simply put the pictures inside the aircraft with the passengers.
Mr. Crown incorrectly quotes the Leonard Cohen song 'The Stranger Song' - he says "It's sad to see another tired man lay down his hand and quit the holy game of poker" when the actual words are "You hate to watch another tired man lay down his hand like he was giving up the holy game of poker".
When Crown walks in front of the delivery truck, the shot from the cab clearly shows that a car is stopped 9 feet in front of the truck. So, why was the delivery truck traveling so fast to begin with? Then, in the long shot after the driver moves on, he accelerates at a high rate, as if there was no car stopped in front of him. If there is a traffic-jam, the car would not have traveled far at all during that time.
During the glider scenes, there's one point where Crown motions for Banning to look to her left but both actors seem to turn their heads to their right. Actually, because of the size constraints of the cockpit, all the interior shots were filmed using a mirror with the camera mounted at an angle. Since the camera sees a mirror image, the actors look to their left out of natural instinct, but appear to look to their right.
Just before Crown steals the painting, he tells the guard (looking at his watch) that it's quarter to five. But when Catherine and Michael are reviewing the security tape, the tape notes "the time of the robbery" as 5:54.
When Thomas "folds" the painting into the briefcase in the first theft he takes it out of the briefcase at his home. He then places it on the hidden shelf with rigid sides. If it had been folded in the briefcase the painting's backside frame would have been broken as well as the painting itself would have cracked. And he didn't have time to fix the canvas or the frame if it had been folded.
When Thomas steals the Monet in the first theft, he puts the painting with wooden canvas stretcher into his briefcase and folds it closed. When he opens the briefcase later, the canvas stretcher is not broken.
When the teacher is talking to the children about the monet Bobby the proctor is slowly walking across the floor. From the high angle he has his arms across his front both touching. Almost in a cross armed position. But when the camera angle changes he has one hand near his mouth.
When the thieves first cut a hole in the wall with a cutting torch, the piece they cut out pivots to the viewer's left. In the next shot, it pivots towards the floor and in the third shot it pivots to the right.
At the police station Janni is in handcuffs wearing a long sleeve shirt over a white t-shirt. In the next scene he is still wearing handcuffs but the long sleeve shirt is removed. Difficult to get a shirt off over handcuffs.
When Catherine Banning arrives in the office in the early morning she has a very potent drink to wake her up because of the jet lag. But if she comes from London, which the movie suggests, the jet lag should cause her to be wide awake at that time.
When Banning has taken Crown's keys, and her people are making duplicates, a close-up is shown on the machine cutting the duplicate key. They are gliding the head across the grooves to cut the slug into the same shape. This is how many keys are duplicated, but not the Medeco high-security model that is shown in the movie. The Medecos are cut one groove at a time, because each groove can be angled in one of three positions.
In the film the painting stolen by Mr. Crown: "San Giorgio Maggiore at Dusk " by Monet, is said to be the first impressionistic painting in the world. But according to Wikipedia the first painting is "Impression, soleil levant", also by Monet, which gave name to "Impressionism".
Having established from the security cameras that someone (Mr. Crown) hid a briefcase under the bench in front of the painting to assist in the robbery, it's curious that the security staff never thinks to wind the tape back far enough to see who put it there. However, under thermal imaging it's impossible to make out people's features, so backing up the video would not have identified Crown.