According to Director Marcus Reichert, when he embarked on making Union City, Blondie was virtually unknown in the United States. Heart of Glass became number one about half way through the shooting schedule.
This low-budget film starring Debbie Harry was in release around the world in the same 1980 year as the big Hollywood studio movie American Gigolo (1980) which featured Harry on the soundtrack with the hit song "Call Me".
This is the only cinema movie music score composed by guitarist Chris Stein of pop group Blondie of which the film's lead star Debbie Harry was the band's lead singer. Collectively, Blondie are credited on the film's soundtrack for the song "Union City Blue".
The movie's opening title card reads: "March 1953". The film, set in New Jersey, was made and released about twenty-seven years after the 1953 year in which it was set. The film's story was updated to the 1950s from the 1930s depression-era period of Cornell Woolrich's source short-story which was first published in that era in 1937.