Other mistake: When Callahan is going to deliver the yellow bag containing the money to Scorpio, he tapes a knife to his leg with sellotape. However, later when he uses the knife to stab Scorpio in the leg, there is no sellotape on his leg.
Other mistake: When Inspectors Calahan and Gonzalez, the chief of police and Lieutenant Bressler are planning the nighttime sting, Gonzalez asks how the rest of the group knows Scorpio will enter the one particular rooftop. The chief of police advises Gonzalez that criminals have behavior patterns. In an earlier point in the film, Gonzalez states he has a bachelor's degree in Sociology. Although profiling and criminology often are studied under psychology, he should at least know how people behave and interact as sociology is the study of patterns of social relationships and people.