The first time Apple Joe appears with his apple cart he arrives at the World Trade Center, but it is the 1970's so it is still under construction. In the final scene of the film, the Man in the Mirror is standing on the modern-day Brooklyn Promenade. The Manhattan skyline is behind him, showing the absence of the World Trade Center.
According to the DVD commentary, the first shot was filmed in 1970, while the last shot was filmed in October of 2006. This is because advances in film restoration made it possible to finish the film, so director Frank Weston added new footage to complete it.
This was the last appearance in TV or film for Michael Dunn, 35 years after he died. He and Phoebe Dorin (who plays the hooker) had previously performed together in a popular night club act in the early 1960s before they became established actors.