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)
Ending / spoiler
Directed by: Brian De Palma
Starring: Robert De Niro, Kevin Costner, Sean Connery, Andy Garcia
After Nitti shoots down Malone in his own home, Ness and Stone follow Malone's last words and pursue Capone's bookkeeper to Union Station. Following a bloody shootout, the bookkeeper surrenders to Ness, giving them enough information to put Capone on trial for income tax evasion. Ness confronts Nitti in the middle of the trial; after a rooftop chase, Nitti brashly admits that he killed Malone and Ness pushes Nitti off the roof to his death. A list in Nitti's possession reveals that Capone (Robert De Niro) had the jury bribed, so Ness intimidates the judge into switching juries. When Capone's lawyers realize that the new jury hasn't been bribed, they change Capone's plea to "guilty"; Capone goes to jail. Ness closes up his office and returns to his family.
NCTanti
More mistakes in The Untouchables
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.
Trivia: As the stroller is going down the stairs in the train station it is a reference to the staircase scene in "Battleship Potemkin" in which a stroller similarly falls down a flight of steps while the horrified mother looks on.
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?
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