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Continuity mistake: Just before the second technician is killed by the robot's pincer stabbing him through the magazine he is reading, if you look closely you can see the holes in the magazine made by the pincer in previous takes of the scene.

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Factual error: Petrol cans sold in shops are always empty. They would never contain petrol when bought. There would be nowhere in a shopping center to get petrol exactly for health and safety reasons.

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Continuity mistake: When the robots are chasing the girls, the girls are all carrying make-shift Molotov cocktails made out of petrol cans with a rag in the neck. Suzie is hit in the leg by a robot and falls to the ground. The robot then fires a laser at the petrol can by her, causing it to burst into flames, which cover her too and burn her to death. However, when the camera pulls back, we see that her petrol can is mysteriously intact and untouched by the flames.

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Plot hole: In the whole film, between the robots and the teens an incredible amount of damage is done to the shopping centre, including smoke, fires and explosions. These things would all easily trigger fire alarms and a sprinkler system...yet the fire alarms never go off.

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Plot hole: In the introductory scene, the scientists are telling the shop owners that the robots are equipped with tazers and sleep darts to tackle intruders. However, when the robots begin to kill people, they are now armed with pincer "arms" and with C4 explosives.

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Factual error: When the first robot is trapped in the lift, the teenagers shoot the propane tanks on top of the lift in order to get them to catch fire and explode, killing the robot. However the teens are firing pistols or shotguns, and these do not contain incendiary ammunition, which is what is required to make the propane to catch fire.

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Other mistake: Walter Paisley is cleaning the floor and encounters the first robot. The whole reason the robots are patrolling at this point is that the shopping centre is supposedly closed to customers, as it is nighttime. However in this scene you can see quite a few people shopping on the upper tier of the mall above Paisley.

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Robot: [After killing anyone] Thank you...have a nice day.

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Ferdy: Look, I'm sorry if I made you angry, Linda.
Linda: It's not you, Ferdy. I'm just not used to be chased around a mall in the middle of the night by killer robots.

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