Factual error: No handgun shots can throw a police officer through the air halfway over a diner. That's just pure Hollywood fantasy (Mythbusters even proved this using all kinds of guns).
Factual error: The Chicago Fire Dept fire truck is red but the real Chicago Fire Department colors are black over red. (00:59:20)
Factual error: When Paul hits Annie in the head with the 15 pound typewriter, she is only incapacitated for 2 or so seconds and has no bruising or bleeding on her face. One would think a typewriter this heavy would at least cause some type of injury to her face, such as bruising or bleeding to her face and would incapacitate her for longer than 2 few seconds.
Factual error: At the beginning when one of the thieves steals the red Porsche, he opens the car with a tool but turns it on without the key in just one second.
Factual error: At the beginning, when those guys robbing the gun store blow Robo's car all to hell, it bursts into flames before he gets out. If he were in the fire, his human face would burn off, being regular flesh.