When Bob Morton gets off the elevator to go to the meeting, the elevator says "95th floor have a nice day" yet after the meeting when there walking back to the elevator it says 120th floor on the wall.
Just before RoboCop removes his helmet, he is wearing a piece that covers his neck and chin. When he actually removes his helmet, the armor is gone.
In the highway shoot-out/pursuit scene between Murphy and Clarence's crew, one of Clarence's men shoots the police car in the windshield and we can see holes in it. Then when we see the car from further, the windshield is perfectly intact. Then it goes back to being bullet-ridden.
Murphy's residence is listed as 548 Primrose, but when RoboCop goes to the house and reads the street sign right next to it, we see that he's in the 3000 block.
When RoboCop's about to be run down by the van towards the end, he fires his usual three-round burst at the windscreen, producing nine bullet holes.
In the POV scenes when RoboCop is being assembled, and the female engineer says "Bring in the LED, lock it down," the tech uses a drill with a drilling bit as opposed to a screw or bolt driving bit.
When RoboCop is at the convenience store on his first patrol, he prevents the robber's shooting by bending the barrel of the gun. In reality, this would have been impossible because the robber was still holding the gun. To create that amount of stress so as to make the barrel bend like that while in the robber's hands, the robber would need to be as strong as RoboCop, otherwise the gun would sooner flip out of the robber's arms than bend.
Contrary to what is often shown in movies and TV shows, lit cigarettes are not hot enough to ignite gasoline, as shown in the destruction of the gas station.
When Kinney is called up to aid demonstrating ED-209, when he is shot, he jumps onto the city model. When he is being shot on the table, the wounds appear as if he was being shot from the ceiling not from the angle of the robot. Of course this is because the blood packs pop "forward".
When the mayor is holding hostages in the city hall, Robocop sees his infrared profile through the wall and grabs the mayor through the wall.
Doing so, there is no sign of the usual 16inch apart wall studs- wood or metal. Wall is just a prop.
Seemingly implausible police reaction times: RoboCop enters the convenience store less than twenty seconds after the clerk presses the alarm. However, it is plausible that RoboCop just happened to be passing by and saw the robber pulling out the gun even before the alarm was pressed, so he could respond immediately. Given the movie's premise of an extremely crime-ridden city, such "coincidence" isn't unlikely. Later, cops confront RoboCop in the OCP's parking garage less than a minute of movie time after Jones calls for them. However, the movie obviously cuts out all the time it took the damaged RoboCop to go some 100 floors down on foot, which could easily take 10 to 20 minutes - enough time for the police to respond.
When RoboCop is at the gun range, Bob Morton is standing behind him and is not wearing protection for his eyes or ears. For issues of safety and legal liability, the range master should not have permitted him to enter a live fire area without protection for his ears and eyes. However, Morton has already demonstrated that as a senior member of OCP, he has no regard for police authority or regulations, because they "own" the police.
While it should be unthinkable to any real estate agent to leave Murphy's old house in the condition it was, unkempt and with garbage strewn about, if any attempt at all was being made to resell it, the house was clearly set up by people who left automated monitors for the tour and didn't care what happened afterward.
The Shell oil station where Murphy confronts Emil shows corrugated garden hoses spooled around a steel wheel as hose coming from the gasoline pump. While no gas station in real life history has ever used such a setup, with spooled-up hose full of gasoline and exposed in the open, directly going against several OSHA regulations regarding the dispensing of gasoline, this is meant to be a future in which corporations entirely disregard safety regulations.
Dick Jones tells Clarence Boddicker during their meeting that there will be "two million workers living in trailers" to construct Delta City. Given that the population of Detroit was about one million people when the movie was made, it would be impossible for such a relatively small city to be able to suddenly support triple that population with all the space requirements for such trailers, in addition to water, sewer, garbage, electric, utility, transportation, food and other infrastructure needs, however, the film takes place in the future where Detroit's population could be well over 2,000,000.
When RoboCop goes to the grocery store robbery and sends the robber through the glass door of the small refrigerator, you can see that the glass is already cracked and starts to break before the man goes through it.
In the shootout at OCP HQ, the rockets ED-209 fires at RoboCop can be seen to travel along a black wire.
When the employee is being shot in the meeting, blood packs are visible on his back.
Dick Jones goes to leave after he's threatened Bob Morton in the bathroom, yet the reflection in the mirror shows he's standing at the door, holding out his hands as if to say "How was that?"
After Clarence blows up the second 6000 SUX in the street with the assault cannon, he tells Leon, who's standing next to him, that RoboCop is in the steel mill and they have to go. When Leon shouts to the others to get ready to leave, he slams his hand down on top of Clarence's 6000 SUX and the interior rear view mirror falls off the windshield.
After the shootout at the Cocaine factory and when RoboCop is throwing Clarence Boddicker through the glass pane. The second pane, you can see it breaking before Boddicker even impacts it and see the dust from when it was set off to early.
At roughly 1:25, when Nash slaps the roof of Boddicker's car to get the attention of Emil and Joe, the rear-view mirror falls off.
Even though the society has advanced effort technology to create ED-209 and RoboCop, they still use a stenographer with an old-fashioned steno machine in the boardroom. One would think they would have a video/audio recording system to handle that.
When Murphy is brought to the emergency room the staff is heard checking for equal breath sounds well before the endotracheal tube is in place. Normally the breathing tube must be inserted before breath sounds are checked.
In the Director's Cut, as Murphy's arm is blown off, he lets out a shriek mismatched to his lips.
[At 32:38] In the shooting range when the camera cuts to RoboCop's gun from Lewis the second pull of the trigger has no effect, RoboCop's gun does not fire despite the trigger clearly getting pulled, then it carries on firing as usual.
When the cops were shooting at RoboCop. Lt. Edgecock tells the cops to "Fall In". But, this does not match his mouth, as if he was really saying "Fall Back".
A crew member is reflected in RoboCop's car during his first night on duty.
The stunt person who spills out of the van after Emil drives it into the toxic waste tank appears to have a thick Mohawk-style hairpiece on his head.
Triggering cords for blood packs are visible in the shootout at the drug factory.
The camera car is reflected in the driver's door of Clarence's car in the final chase.
During Dick Jones' speech in the boardroom, the entire camera crew is visible on the wall of TV monitors.
Dallas landmarks appear in "Detroit" throughout. (See trivia.)
During the gas station scene, a "California Bell" telephone logo can be seen on a pay phone in the background.
[16:34]The story takes place in Detroit, but during the initial car chase scene of the truck after the robbery, a building with a sign "Texas Industries, Incorporated" can be seen to the right.
Lewis starts crawling towards the assault cannon even before she notices Leon Nash approaching the machinery booth to drop the steel on Robocop. It makes no sense for her to go for the cannon before seeing Nash, especially when Clarence is the only immediate threat and Lewis' own gun was still in her holster.
It is shown in several scenes that Robocops armour is immune to bullets (they just bounce off of him), yet when the police fire on him in the OCP garage it shows visible damage.
In the close-up of the cocaine dispensing machine, the glass vial rises up to the nozzle only to be dropped a second later causing most of the cocaine to be released into the air.
Most modern police stations have a sally port (a separate entrance for police vehicles only; a secure, controlled entryway to a fortification or prison) where they load and unload prisoners. In this case, this police station DOES have a sally port. Lewis (and later RoboCop with Clarence) should have brought their prisoners in through the sally port, not into the lobby where they could have posed a threat to civilians.
When murdered cop Frank Frederickson's nameplate is removed from his locker in one of the opening scenes, it's spelled FREDERICKSON; however, when RoboCop later scrolls through the police computer looking at Boddicker's rap sheet and scrolls past Frederickson's murder, the name is spelled FREDERIKSON (with the C missing and the N off-screen) - it's simply spelled incorrectly by some underpaid station clerk.
When we see the police officers on the shooting range, the person shooting in the last booth has his pistol held out straight, and continues to pull the trigger despite the fact that the slide is in the lock and safety position.
When RoboCop is confronted in the OCP garage, the police commander issues a full assault against RoboCop, and then elevates the assault by saying "Move in!". An experienced commander should not command his troops to open fire in this manner, particularly when the target is unarmed and showing no signs of aggression, due to the high risk of ricochets (from either the concrete or RoboCop's armor) hitting police officers. However, the objective has been sent down by Dick Jones to destroy RoboCop, and this police commander is not particularly competent.