Continuity mistake: At the start of the movie when the gun store is being robbed, one of them fires a portable rocket launcher at the police car, causing it to roll over and spin. As it comes to a stop just outside the store, it's visible that the driver's side window has been blown out, and the vehicle interior is visible, however when the same guy prepares to fire the bazooka to finish it off, the window has returned and is completely intact.
Continuity mistake: When RoboCop is in the street with his new directives, he shouts "Back" at Lewis and puts his hand down to take his gun out. We can see his hand going down beside his leg and then coming up with a gun, but his hand was nowhere near his leg, and even though we hear the leg opening sound effect, the leg never moves. The same sort of mistake happens after RoboCop 2 destroys the Nuke hideout. RoboCop is investigating, and afterwards puts his gun away. The gun goes down to his leg, but the leg never opens, yet the sound effect is played. Sloppy camera work is responsible for both cases, it should have been higher up.
Continuity mistake: When RoboCop gets out of his car in the scene where the baseball coach is firing at him, the building behind him is reflecting the sun and looks very bright. Less than 2 seconds later we see RoboCop walking towards the electrical shop and the building is very dull looking. Where did the sun go? (00:50:36)
Continuity mistake: When Caine's cronies throw the dismantled RoboCop out of the limo in front of the police station, take a look at the shot of the pile of parts. Both of his forearms are intact from the hand right up to the elbow. However, his right hand was blown off at the wrist just before he was "stripped".
Continuity mistake: When RoboCop and Lewis go to deal with the baseball kids robbing the electrical store, they are shot at and Lewis spins the car round. We cut to a close up of the car and see Lewis get out, meanwhile RoboCop opens his door and puts his hand on top of the car, supposedly to get out. A few moments later he is still siting in the car, arms on his legs. So why did he put his hand up? (00:50:12)
Continuity mistake: RoboCop overtakes Cain on his motorbike, and we see a shot from inside Cain's van. We can see that both of them are very close to the end of the street, and there are two small buildings on the right side of them. The width of those buildings are all the space that stands between them. RoboCop then builds up speed to about 60mph and charges towards Cain, passing several buildings on his right. There is no way RoboCop could have travelled that fast in that short a space, and there is no way he could have passed more than 2 buildings. (01:02:54)
Continuity mistake: When RoboCop is being scraped up against the wall creating a shower of sparks, we cut to views of Cain. In one of these shots of Cain, the background suddenly changes - the wall he's scraping up against is nowhere to be seen and the sparks vanish. In the other shots of Cain, the background is correct. For some reason, a shot was taken from another part in the sequence and added in here, creating an odd continuity gaffe in the background. (01:02:02)
Continuity mistake: When RoboCop is at the Nuke hideout, he looks around the various artifacts that the gang have stolen. One of them is the skeleton of Elvis in a glass coffin. When we see the coffin from RoboCop's POV, (he is standing to the right of the coffin), there is a picture of the real Elvis to the left of Elvis's skull. When we cut to a wide shot of the room, RoboCop is still standing to the right of the coffin, but the picture beside Elvis's head has moved to the right hand side of Elvis's skull. A guitar which is sitting beside the coffin is pointing inwards during the Robo POV shots, but in the wide shots, is pointing outwards.
Continuity mistake: Cain's extraction in the glass tube had green eyes. Earlier he appeared to have brown eyes.
Continuity mistake: During Cain's escape attempt RoboCop seizes someone's motorcycle. The motorcycle's lights vary between being on or off throughout the scene.