The dramatic closing scene-- Duncan laying there dead, with dollar bills strewn all around him-- loses its effect because we see some of the dollar bills up close: they are obviously fake, like Monopoly money. Couldn't they have photocopied some real bills? And besides, why are the bills labelled "ONE"? Shouldn't he be taking $100 bills with him?
Warehouse Man: When it comes to booze there is no Depression.
Ness: It's not a modest amount when it passes into the hands of the Capone Mob.
Torrio: We're gonna sing a birthday song but first I'm gonna blow out those 96 candles.
Carvel: You're up against an outfit with powerful political connections.
Ness: We'll try not to step on any toes that don't deserve stepping on.
Ness: The meeting must be pretty urgent to bring Johnny Torrio out in the daylight. It isn't a social call.
Torrio: It's your business to pay and my business to collect.
Welles: Pigs! Swine! Butchers! Choke on the money!
Torrio: Well, if we've gotta choke, I can't think of anything better to choke on than money.
Rico: Are you Italian too? With a name like Welles?
Welles: Names can be changed.
Narrator: All of Ness's questions had gone down the drain with Brooks Welles' blood.
Duncan: I'm going to friends in Washington! You can't get away with an accusation like that. They'll break you, Mr. Ness!
Duncan: I've been running this thing for five years and what have I gotten out of it? I haven't got a dime.
Torrio: You want I should have tears in my eyes? All right, I got tears in my eyes.
Duncan: I'll need time to get a hold of the million dollars.
Torrio: Take all the time you want. You got 24 hours.
Duncan: My beloved principals. Between them they've taken nearly 30 million dollars from me.
Ness: You mean from Brawley Mills.
Vince: Torrio says not to miss. We're to get 'em all. Ness, Duncan, all.
Torrio: Why, you fool! You stupid fool! If we didn't need you to play bigshot, you'd be fishin' in a concrete boat!