Continuity mistake: During the meal, when Al Capone says he loves baseball, the man on the right holds a cigar with his hand. A shot later, from another angle, the cigar is on a plate and he is clapping.
Continuity mistake: A man enters Ness's office and throws a manila envelope on top of a sheet of paper. In the close-up, the paper transforms into a folded newspaper and the envelope appears perfectly lined on it.
Continuity mistake: In the elevator murder scene, in one shot there's not much blood on the wall, but in the very next shot there's much more.
Continuity mistake: In the final court case, as Eliot Ness escorts out Nitti, Ness's wife watches them leave and is wearing a brown and cream hat, with a brown jacket. When the case finally resumes and the guilt plea is changed, Ness's wife is again shown, except this time she's wearing a light blue hat with dark blue ribbon, a blue jacket, with a floral green and blue blouse.
Answer: 'Vesti La Giubba', an aria from the opera 'I Pagliacci'.
jle