When Johnny says Acey is "taking a bath" He's referring to an Acid Bath, an infamous method used by criminal types to dispose of bodies. Notice how Snakes looks a lot more fearful after he hears it? Johnny just told him to his face he's killed his boss.
The original script was supposed to have Harry and Mary in those blue prison uniforms in the rec room at jail watching this movie and this scene during the closing credits. They look at each other and realize that this is where they heard the name Snakes from.
I think it’s based off of a film with a similar title called men with dirty faces or something like that. I don’t remember what the first part was, but I could swear the dirty faces part was in the title.
How did no one call the cops when Kevin tried this on him. Deleted scene: A SWAT team kicks in the McCalister door after recieving a report from pizza delivery driver that he was shot at.