The mole on the side of Anthony Hopkins' head was added, due to the fact that Wentworth Miller has a mole on the side of his head. Hopkins also wore green contacts to match the color of Miller's eyes.
According to Wentworth Miller, the casting agent did not believe that he was part-African American like the character Coleman Silk. Miller also told the casting agent about an incident at Princeton University. While he was a student there, he published an editorial cartoon in the campus newspaper that was misconstrued as a racial slur against Professor Cornel West. Silk has a similar situation in the film. Miller faxed family pictures and articles about the controversy to prove his story. West later attended the film's premiere and made up with Miller.
When Coleman first gives Faunia a ride to her place, it is raining outside. When he gets out of the car to go inside, the entire windshield is dry and clean as a whistle, even the area that is outside the reach of the wipers.
When Coleman and Faunia are talking in the kitchen, the cigarettes and the lighter on the counter (next to Kidman) keep changing position from scene to scene.
Nelson Primus: How do you know she doesn't want to use you to make up for all that she's lost? Do I represent you in a paternity suit, Coleman? "Give up the girl, Achilles." I took your intro to European lit umpteen years ago as an undergrad. Give her up, and your troubles go away.
Coleman Silk: You can't make a college without breaking egg heads, and uh, I couldn't write a book called Spooks that didn't sound like the raving of a lunatic.