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.
Continuity mistake: While Lewis is shooting the baseball coach, she makes two holes on the glass of the van but they disappear when Robo is holding the dead body.
Continuity mistake: When the girl is spraying graffiti on Robocop, the last mark on his head is a light dot. Yet a moment later when shooting at the smoker, it's a bright orange line.
Continuity mistake: When all the cops go into the nuke factory and one cop is hit in the leg, the other cop puts his hand over a bar and yells "give me your hand." As he pulls him, his hand is now under the bar, even though he never let go of the cop's hand. (01:02:00)
Continuity mistake: Robocop shows up at the presentation of RoboCain, but he disappears in the wide shots, only to suddenly reappear when the shooting starts.
Continuity mistake: When RoboCain steals the remote control, there's a woman in black walking up the bleachers. A shot later, right when RoboCain clicks the button, the woman is suddenly way behind.
Continuity mistake: When RoboCain smashes Robocop against the wall, the shape and size of the hole, plus the cracks around, change 4 times during the fight, depending on the shot.
Continuity mistake: When Robocop lectures the kids about the hydrant, they are suddenly standing closer together between the first and second shot.
Continuity mistake: When "Robocop 2" goes beserk, he shoots several civilians and a row of OCP security. The last civilian to be hit in that scene is later seen being helped down a flight of stairs by two folks as the President of OCP talks with some of his subordinates about who to lay blame on for the incident.
Answer: We're never given specifics about it, but we do know it's the most addictive drug in history.