In the theater lobby, when Mayor Pappas asks Frank Anselmo what he thought of the musical play, Anselmo replies "Good act. No voice. My Nettie could sing better." Nettie Anselmo, Frank Anselmo's wife, was played by Roberta Peters, a famous opera singer.
The music in the theatrical trailer of 'City Hall' is from the film 'Hoffa' and composed by David Newman. The same music was used to advertise in the theatrical trailer of 'L.A. Confidential'. 'City Hall', 'Hoffa' and 'L.A. Confidential' all had corruption as a major theme.
The trivia items below may give away important plot points.
The character of Frank Anselmo was based in part on Brooklyn-born Queens Borough President Donald Manes, who was caught up in real estate development scandals and attempted suicide in his car in 1986 by slashing his wrists. Although he survived, he succeeded in killing himself two months later by plunging an eight inch kitchen knife into his heart.