Charles Bronson uses a Wildey .475 Magnum hand cannon in this movie. It was his personal handgun in real life, and he suggested it as a means to make the film unique. In a 2005 interview in 'American Handgunner' magazine with Wildey Moore, the gun's creator and a technical consultant to the production, Moore said that sales for the weapon increase each time this film is aired on cable television. Moore said: "To this day there is a spike in Wildey Magnum sales every time 'Death Wish 3' appears on cable TV."
According to the book 'Bronson's Loose' by Paul Talbot, the original working title "Death Wish III" was changed to "Death Wish 3" because the Cannon Group conducted a survey and found that nearly half of the U.S. population could not read Roman numerals.
This was the first 'Death Wish' movie to be made after the Bernard Goetz vigilante shootings in New York. After this, Charles Bronson publicly stated that he recommended that people not imitate his character Paul Kersey from the 'Death Wish' movies.
As principal photography was mostly filmed in London, the movie featured extras and background artists playing a variety of characters including police officers and gang members. Their audible dialogue, however, was in the British accent. This movie was set in New York and required American accents. As such, during post-production, director Michael Winner enlisted the assistance of the military personnel of the US Air Force stationed in England to dub over these UK accents.
Charles Bronson rarely granted interviews, or commented on his own films. However, he plainly stated his unhappiness with this film at least a few times, and was especially angered when he discovered that the director filmed extremely gory shots with extras (as nameless thugs) when he was off-set.
After Death Wish II (1982)'s setting was transposed from New York in the original Death Wish (1974) movie to Los Angeles, this next sequel returns the setting to New York, though ironically, most of this picture was filmed in England.
Oddly enough, two ideas from the original novel Death Wish actually made it into this sequel; the vigilante rents a car to use as bait for street thugs, and a giggling Puerto Rican male appears. According to the book 'Bronson's Loose' by Paul Talbot, a movie novelization of Death Wish 3 (1985) was announced, but was never published when it was pointed out that 'Brian Garfield' retains the literary rights to the series, and he refused to allow a movie novelization.
Final 'Death Wish' movie to not have a subtitle as part of its film title. Both the next two sequels included title subtitles: Death Wish 4: The Crackdown (1987) and Death Wish V: The Face of Death (1994). An intended but unfilmed sixth movie was also to have a subtitle: 'Death Wish 6: The New Vigilante'.
A variety of weapons were seen in this movie's grand action finale. They included a German Second World War MG-42; a Wildey .475 caliber handgun; a Browning .30 caliber machine-gun; a .38 caliber snub-nose revolver and an anti-tank rocket launcher.
Screenwriter Don Jakoby had his name removed from the movie in favor of pseudonym "Michael Edmonds". However, Jakoby's name and writer credit remained on the trailer, which is included on the MGM Region 1 DVD.