From The Grindhouse Cinema Database
- Graffiti on a wall in a sewer at the end of the film reads "Harry Lime Lives," a reference to the character from The Third Man (1949) who was killed in a sewer.
- On a blackboard in the background of a press conference, a message refers to one of the victims being Edward Norton, a character from "The Honeymooners" (1955), who was a sewer worker.
- The proceeds that John Sayles earned from his screenwriting duties were used to finance Return of the Secaucus Seven (1980).
- The shot of the swat team emerging from the sewers looked so real that people actually thought they were terrorists and some even called the police.
- Robert Forster was recovering from a case of spinal meningitis when principal filming began.