Continuity mistake: When Creasy's friend Ray is sitting on the couch at the Agency for Federal Investigation and calls Creasy an artist of death, from a side shot he eats a piece of food, licks his fingers clean, and from the shot it is clear that he is holding nothing in his hand. However, on the next shot from the front, Ray is holding something in the same hand, points to it with the other hand, leans forward and throws it on a plate, then picks up a napkin and wipes off the fingers he had just licked clean in the shot before.
Continuity mistake: Within the first hour of the film in the scene where Creasy is driving Pita and her mom to school, the mom is seen sitting behind Creasy in some shots and sometimes there is no one behind Creasy when it changes camera angles. Then towards the end of the scene the mom appears behind Creasy once again.
Continuity mistake: As Creasy is crossing the street, searching for a site to use the RPG, he is followed by a couple, a blonde in a striped top, and a man in a leather jacket. The couple passes in front of Creasy in one close-up, passes behind him in a second, long shot, then passes in front of him again in the next close-up.
Visible crew/equipment: When Denzel is trying to get information on Samuel Ramos he is talking to a woman on the phone. When we first see her talking next to her computer, this shot begins looking over a rail and pulls back. As the camera pulls back, the track that it is sitting on is visible on the bottom right of the screen. You can also see electrical wire next to the track.
Continuity mistake: When Creasy kills the first Judicial Policeman, the scene where he cuts the guys fingers off and then shoots him in the head, he pushes the car down a hill. The first angle is from Creasy's view, and the hill is all dirt. It then cuts to a second angle from the air, the hill is now all grass. When the car hits the school playground, it looks like it fell from the sky, with no hill around. (01:22:15)
Continuity mistake: When Creasy is trying to get the number plate of the car following him, Pita is trying to write the number down as well. It can be seen that the last number (9) has been rubbed out. Creasy later finds the diary with the correct number in place.
Continuity mistake: Near the start of the movie, when Lupita's father is talking in the restaurant, the flowers in front of him start off facing to the left, toward the other man at the table. However, after Mr. Ramos says that he is letting his bodyguard go, the flowers are facing to the right, toward him.
Other mistake: When Creasy thumbs through Pita's journal (which, unusual for American English, is addressed by her as "Dear Diary"), you can catch a glimpse on her first entry, made on a page titled "January 1", but reading "Today at school I had a great time." So, if she's alleged to be keeping her diary true-to-date, she's describing a school day on New Year's Day. Also, her handwriting changes considerably within the next three months (cf. April entry) - but then suddenly changes back in June.
Other mistake: In the cemetery all of the headstones are blank except for Ryer. (01:26:25)