Revealing mistake: After Garber shoots Ryder, he is told by the approaching policemen to "drop your weapon". At which point the camera pans to a shot behind Garber where he is holding the gun in his right hand and proceeds to drop it. Watch the bottom of the screen and you will see Garber catch the falling gun with his left hand.
Revealing mistake: The police car that transports the money is not what is used in actual police work. The all dark blue and white accents you see in the film is a color-scheme used in traffic cars and school safety cars. The real police cars are white with dark blue accents.