The scenes at the snowy train station were actually filmed in 80-degree weather.
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.
In the scene in the theater lobby, when Major Pappas asks Frank Anselmo what did he think of the actress playing Julie Jordan in the musical ‘Carousel’ they had been watching, 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.