Continuity mistake: Dick Jones brags (admits?) to Robocop, "I had to kill Bob Morton because he made a mistake. Now, it's time to erase that mistake" while Robocop is crouched on the ground, looking away from him from across the room. In the playback, Jones is facing the camera as though it were videotaped or filmed in a studio.
Continuity mistake: When Clarence is talking with the other drug dealer in the warehouse, tempers flare and guns are drawn. The Asian gang member racks his shotgun (thus loading the weapon). Wouldn't he have kept it loaded? Anyway a few seconds later Robocop enters and the same Asian guy racks his shotgun again and no shell is ejected.
Continuity mistake: When the bearded man is robbing the convenience store, he demands that the owner opens the safe. Look at the Lite cans on the safe. When seen from the right, there are four cans. When the owner kneels down to try and open it, there are now three. When we cut back to a view from the right there are again four. Finally when the robber is shooting at Robocop there are only two.
Continuity mistake: When Bob Morton, Johnson, and Kinney get off the elevator, a computer voice chimes that it's floor 95. After the board meeting, Morton and Johnson leave the board room (and it's the same floor as you can see the two paintings on the wall that lead to the board room) a sign next to the elevator says "120."
Continuity mistake: When Clarence sets down the grenade on the table, we can see that there is a glass to the left of the grenade. When the view changes so we can see the whole room the glass has moved to the right of the grenade, then when we see Bob reaching for the grenade, there is no glass on the table.
Continuity mistake: Just before Clarence Boddicker crashes his 6000 SUX into the water after colliding with Lewis' Taurus Cruiser, there is a scene where his car is charging toward the camera, and a hubcap comes off and whistles past the camera, in fact they even put in a sound effect. But in one of the next shots, the hubcaps are back on.
Continuity mistake: In the drugs factory, when Robocop starts to bang on the door, you can see at least 4 people on the stairs and overhead walkway. After Robocop knocks the door down and looks around, we see this through his view and they have vanished. They reappear when the camera view returns.
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.
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.
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.
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.
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.