One model that played a prominent role in the film was a Renaissance version of a hang-glider. This was one of the few pieces that was not a true replica of a Leonardo da Vinci work. As built and engineered by the Aero Vironment company of Simi Valley, California in the U.S. However, the glider did have its ties to da Vinci through his studies of man-powered flight. Aero Vironment picked up where da Vinci left off, and with the addition of modern aerodynamic engineering, produced a working glider based on da Vinci's designs.
Despite the late hours of the filming as well as the odd location for the Brooklyn Bridge chase sequence, hundreds of New Yorkers strolled the Brooklyn Bridge's walkway in order to get a glimpse of the action and, of course, star Bruce Willis. The actor later appeared on the local news to thank New Yorkers for their interest, cooperation, and above all, patience.
In the bar, Bruce Willis talks about "reindeer-goat cheese pizza", which he also mentions in The Last Boy Scout (1991).