Continuity mistake: When the ED-209 gets to the stairs and tries to give the first step, its right arm changes from having one cannon and missile launcher to having two cannons and two ammo clips of sorts (just like its left arm). When ED slides and is falling, the arm changes back to normal; and at the end of the fall, its arm has two cannons again.
Continuity mistake: When Clarence is in Bob's house killing him, he sets a grenade on the table. If you watch carefully after Clarence pulls the pin out of the grenade, the timer is actually facing towards Bob as it is set on the table. When Bob crawls over to it the numbers are facing towards the camera, so we can see it counting down. (00:58:33)Padzter
Continuity mistake: When the guy holding the mayor hostage gets thrown out of the window, we see the only two TV cameras near the location follow his fall down to the ground. A few seconds later on the news though, the footage is the same shot we saw in the film, staying focused on the window. (00:39:55)Jon Sandys
Continuity mistake: You have to watch REALLY closely for this one. When Clarence and the gang are in the mill looking for RoboCop, we see RoboCop on the floor above them. He walks to the ledge with the mirror in his hands, but when we see a closeup of him, he has to bend down to pick up the mirror. (01:24:37)Padzter
Continuity mistake: In the end scene Robocop shoots Dick Jones out the window while he is standing in front of the television screens, then he spins his gun and puts it into his right leg. The camera view changes to focus on his leg, and you can see he is not standing in front of the screen and a person's legs appear standing behind Robocop, with black corporate pants and leather shoes. In the next shot when it focuses back on Robocop, he is back in front of the television screens again after putting his gun away. Obviously the leg view is from a dummy, because the blood & damage on it was missing in that shot. (01:36:00)woweeee
Continuity mistake: RoboCop walks past the police department lobby for the first time, following Bob Morton. Robo is walking at a very slow, deliberate pace. The rest of the cops in the department run as fast as they can to the far end of the building to see where they are taking him. Despite running about four times faster than Robocop he has already cleared the end of the hallway and is in the regeneration room before the cops get there. (00:29:50)
Continuity mistake: During the pursuit of the armoured van when the gang open fires on the police car, the amount of damage to the car keeps changing throughout the scene.