Continuity mistake: When Ness is "escorting" Nitti off the roof of the courthouse, watch the proximity of the two to the rooftop door. When the camera cuts from the edge of the roof to Nitti and Ness and then back to the edge of the roof, you can see that they went from close to the rooftop door to really far away from it.

The Untouchables (1987)
Plot summary
Directed by: Brian De Palma
Starring: Robert De Niro, Kevin Costner, Sean Connery, Andy Garcia
During prohibition-era 1920s Chicago, Eliot Ness (Kevin Costner), who works for the Treasury Department, is put in charge of arresting gangland kingpin Al Capone (Robert De Niro). He recruits a team of men including Jim Malone (Sean Connery), Oscar Wallace (Charles Martin Smith) and George Stone (Andy Garcia). They come to be known as 'The Untouchables' in this true story.
NCTanti
Elliot Ness: I have one more thing to say. I know that many of you take a drink. What you've done before today is not my concern. But now we must be pure and I want you to stop. It's not a question of whether or not it's a harmless drink, it may very well be, but it's against the law, gentlemen, and as we are going to enforce the law, we must do first by example.
Question: In the scene where Malone is shot by Nitti, he crawls to a room and when Ness comes in he finally gets Ness to see the paper about the man coming into the train station. If that information was so vital why was he just roaming around his apartment instead of going to Ness to show him?
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Answer: Ness was coming to Malone's apartment to discuss the information with him there, Nitti and his men just got there first.
Captain Defenestrator