Deliberate mistake: When the board member is shot up in the beginning by ED-209, in one or two shots you can see the bullet impacts happen about 1/2 a second after the shot starts (Criterion DVD version). (00:11:55)

Robocop (1987)
1 deliberate mistake - chronological order
Directed by: Paul Verhoeven
Starring: Ray Wise, Ronny Cox, Peter Weller, Miguel Ferrer, Nancy Allen, Dan O'Herlihy, Kurtwood Smith

Revealing mistake: In the shot where Dick Jones is falling from the top of the OCP building, both of his arms appear to be about a foot longer than they should be. (01:36:30)
Robocop: Dead or alive, you're coming with me.
More trivia for Robocop
Question: When Robocop is about to arrest Jones, he suddenly feels his system malfunctioning. Jones then explains that Directive 4 is used to shut him down if he attempts to arrest a senior officer of OCP. Why did Jones put this directive into Robocop? At the time nobody knew he was working with Boddicker.





Answer: Because he knew he was doing illegal activities. Robocop was said to be highly efficient at his job and Jones did not want to risk him out on the streets without the insurance of shutting him down if Robo came after him.
MasterOfAll