Lt. Laker questions Stella and writes down his telephone number on a piece of notepad paper for her. Later, when she decides to call him, she has his business card.
In the climax scene on the subway platform, Elizabeth McGovern's hair changes from being neatly styled, to noticeably frizzy and loose, then back again.
When Michael Caines' character first gets into the cab to go to the train station, he tells the cab driver, "Grand Central Station". Grand Central Station is New York cities main post office, the train station is "Grand Central Terminal".
The artwork for the UK videocassette release has Caine in suit, posing and holding a cigar. Closer inspection reveals that the body is blatantly that of another person with Caine's head quite badly superimposed onto it.