Corrected entry: After the scene where Amelia has found the old man and the young girl in the water, Amelia is looking at the next item of evidence and describing it to Rhyme (Denzel) on her mobile phone. Then the stupid cop who has taken over the case from Rhyme arrives and grabs the phone from Amelia. While he is talking on that phone, Amelia runs off and explores the abandoned subway station. Somehow she has got a mobile phone again to resume her interaction with Rhyme.
Factual error: At the end, Denzel Washington's character has a Grand Mal Seizure. But he is supposed to have a spinal cord injury. He can still have seizures in that the electrical impulses in his brain go haywire, but if he has a spinal cord injury that prevents him from moving, the seizure action in his brain wouldn't translate to his body jerking and shaking.
Lincoln Rhyme: Whatever happened to your father doesn't mean it's gonna happen to you. You're a great cop. You'd make a terrific detective. It's a gift. Don't throw it away.
Trivia: The movie makers really wanted the audience to believe that Michael Rooker was the killer, rather than Leland Orser. So much so that Rooker actually played the killer in almost all the scenes where the killer wears a mask. When you see the eyes of the killer through the mask the eyes are Rooker's.