- Continuity: When Wesley Gibson has been tied to the chair and had his face punched, there is a clear cut on the bridge on his nose which disappears then re-appears in some shots.
- Revealing mistakes: During the chase sequence in which Wesley drives the Mustang and Fox drives the C4 Corvette, a camera shot briefly shows Fox's hand down shifting from above. However, it shows the shift lever from the Dodge Viper used earlier in the movie.
- Continuity: During the first car chase scene, after Fox's car drives off the bus, the back window busts out. Minutes later the window is reinstalled with minimal damage.
- Continuity: When Wesley confronts Pekwarsky he pulls back the hammer of his pistol. On a closer shot, with the gun to Pekwarsky's head, he uses the trigger to slowly pull back the hammer.
- Revealing mistakes: When Wesley returns to his apartment to retrieve his father's gun, Barry's missing tooth is clearly blacked out.
- Continuity: The tooth that is seen in slow motion flying out of Barry's mouth after Wesley hits him with the ergonomic keyboard is clearly a lower molar, but when Wesley returns to retrieve his father's gun, the lost tooth is his upper incisor. While it could be argued that Barry lost more than one tooth, it would be unlikely to occur since the teeth are in different regions of the mouth, and Wesley only delivered one hit.
- Continuity: Just before Wesley and Fox jump over the roof of the train for the first time for training, Fox is wearing high heel boots. After they jump, Fox is wearing flat boots.
- Audio/visual unsynchronized: At the scene when Wesley is told to shoot the wings off the flies, Gunsmith holds a gun to his head. When he cocks the hammer back, there is a sound clip of a gun being cocked by hand from the barrel, not a click of a hammer.
- Continuity: The initials branded on the side of Fox's neck (seen after she tells the story of how her father was killed) are never there before or after this particular scene. This is especially obvious during her initial meeting with Wesley, since she has her hair pinned up and her neck fully exposed.
- Continuity: After Sloan curves the bullet, in the scene where Fox and Wesley are walking along the factory wall, Fox's hair changes style.
- Factual errors: On both killing orders shown in the movie is a statement starting in big letters "I Hereby Acknowedge...” which is an obvious typo.
- Factual errors: At the train station is a door leading to an elevator with a text that says "An elevator with an operator" in Czech but the letters with accents in the word operator are wrong obviously translated on a computer without Central European fonts, which is a common mistake.
- Continuity: In one of the later bullet curve training scenes, Wesley slices through the edge of the pig with a bullet, but in the next shot the bullet hole is an inch or so inside the outline of the pig and there is no tear to be seen.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Crew or equipment visible: SPOILER: When Wesley is in the recovery bath removing the bullet from his shoulder, his shirt sleeve shifts to reveal the puckered edges of the latex covering the spurting blood-pack.
- Continuity: SPOILER: In the last scene, when Wesley sets up Sloan, when the camera shows Sloan looking down, you can see the cross made out with post-it notes, however only seconds before when the camera is approaching Wesley's desk, you can see the floor but no post-it notes.
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