Factual errors: The gold stolen is said to be worth more than $22 million as they are 90lb bars. However, the bars clearly do not weigh that much. They appear to be the standard gold bar size which is 400oz (or 25lb) with dimensions of approx 8" x 3" x 2". Also, the bars depicted are marked only "24K" whereas real bars would have serial numbers on them. (Additionally, if the bars really were 90lb each, they would not be able to be piled up in the back of the van without causing damage - they would weigh more than two tons)
Continuity: Paul Vitti's legs are uncrossed in the next shot after Dr. Ben Sobol asks him to cross his legs in his office.
Errors made by characters (possibly deliberate errors by the filmmakers): When discussing the value of the gold, Vitti says: "$350 an ounce, 16 ounces to the pound, 90 pounds to the bar." Precious metals are measured in Troy weight in which there are twelve ounces per pound not sixteen as in the Avoirdupois system.
Continuity: The amount of liquid on Paul Vitti's eyebrows and nose changes between shots while Dr. Ben Sobel is preparing to inject him with saline in order to determine whether or not he is really catatonic.
Continuity: Laura's hair completely changes between shots when she is talking to Ben after the sushi dinner scene.
Continuity: When Dr. Sobel first meets Viti in jail, you can see what looks like a car's taillights outside of the cell's window. They suddenly vanish between shots.
Continuity: As Dr. Soble says to Viti, "Paul, that is not funny," you can see him pointing at Viti. However, his arms are crossed in the next shot.
Crew or equipment visible: Safety divers partially visible (trying to be submerged) in the water after the car ends up in the harbor.
Revealing mistakes: When Dr. Sobel pinches Paul with the needle you can clearly see that the needle disappears in the shaft and when he removes the needle there is no pinch hole in Paul's pajama pants.