Revealing mistake: After Jones "introduces" ED-209 to Robocop, as he is descending the stairs, the top step can be seen through Robocop's head. This is because ED-209 is a stop-motion animation, and Robocop was matted into the scene.
Revealing mistake: In the closing scenes where Robocop pulls up outside the offices of OCP, he fires the rifle (in fact built around a slightly modified Barret Light 50 fifty caliber semi-auto rifle) at the ED209 across the roof of the car and destroys it. As he watches the robot and grins just before putting the rifle down, you can see he has what is known as a "stovepipe", in other words the last fifty caliber blank crimped shell fired has failed to eject fully and is stuck there poking out the side of the action just in front of his face (towards the left of the picture). The crimped end of the large brass case is easily seen. This is common with blanks in a gas operated semi auto which may not cycle the action fully - not the live ammo he's clearly meant to be using.
Plot hole: When Murphy is in the changeroom at the station, he learns that an officer has just died and that his funeral (according to the captain) would be the next day. There's simply no way a funeral can take place one day after someone's death. All the planning, prep work and getting the body released to the funeral home would take about a week...plus many other things. Simply cannot be done.
Factual error: Robocop foils the convenience store robbery by (in part) grabbing the robber's machine gun by the barrel and bending it downwards. For this to happen the robber would have to have a grip strong enough to hold a steel machine gun steady in his hands. That is absurd. The gun would simply be levered out of his hands intact If he did manage to hold on tightly enough (unlikely) he'd he lifted off his feet.
Continuity mistake: When Robo is shooting at the police station at the practice area, he's firing for a while before we see the target, and it's nowhere near destroyed enough for the number of bullets he's already fired at it.
Revealing mistake: When RoboCop goes to arrest Dick Jones and starts to shut down, as he twists and turns we can see his real left arm in a black body suit under the costume.
Continuity mistake: When the ED-209 kills the businessman, his chest and tummy are covered in blood. However, when he falls backwards, the shirt is clean except for a small spot with blood.
Visible crew/equipment: Robocop shows up at city hall and is hounded by reporters. We see his point of view. The shadow on the bottom left is that of the camera filming the shot. It noticeably has a shade so light doesn't reflect into the lens and is visible at least twice.
Continuity mistake: Murphy has blood on his head right after he's shot in the arm. It wasn't there before.
Continuity mistake: During the beginning shootout, the police car's windshield is shot twice, obscuring visibility. The cop car pulls up along side the van. The holes in the windshield are gone. They return in the next shot.
Visible crew/equipment: Before he collides with Lewis, when the camera goes in close to Clarence driving you can see the camera crew and equipment reflected on the door.
Continuity mistake: In the steel mill, as Clarence and company are walking along, in the wide shot Murphy comes in from his left side holding a piece of metal. In the close up he picks up the metal to toss.
Continuity mistake: When RoboCop is in the chair for the first time, he is recording Roosevelt saying ahhh. When RoboCop is ordered to play it back, Roosevelt says ahhhh but the tone is much higher.
Revealing mistake: When Robocop uses his thermal vision to see the hostages and gunman through the wall, you can see a long zipper in the back of all the thermal color pattern costumes they all wore to simulate thermography. This was most likely invisible to the eye in a dark theater but on an HD screen, it shows.
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.
Visible crew/equipment: As Robocop first drives out into the city, there is somebody's head in the extreme right side of the frame, even though he's alone in the car.
Revealing mistake: As Boddicker swings the bar at Murphy, as Murphy's head drops down while deflecting the bar, the skin make-up at the line where it meets the part covering the back of his head wrinkles up a moment.
Continuity mistake: When ED-209 is firing rockets at Robocop, the launcher pops up, and the first rocket launches. A moment later, the launcher pops up again, but the top tube has a rocket. The second tube launches, the top tube is empty. Obviously a re-use of the original shot.
Visible crew/equipment: As Robocop walks through the abandoned house, his memories of what it used to look like come into play. The gold vases in his memory reflect the camera crew and equipment.
Continuity mistake: At the convenience store, Robocop stops the burglar from fleeing by knocking him on the jaw, making him fall backwards. A frame later Robocop's arm is extended and the man is flying forward, falling face first.
Answer: When Bob Morton is told by a tech that one of Murphy's arm was saved, Bob stated that he wants total body prosthesis. Meaning Robocop's entire body was synthetic. None of his actual body was used. The only thing that was used was Murphy's actual face.
Also, his human brain, and possibly his spine, where OCP could wire him into the suit.
Movie Nut