During the height of the show's popularity, Edward Woodward was often approached on the street by people in need, with situations similar to those depicted in the show. He began carrying flyers with the phone numbers of social services organizations and legal clinics for them to contact.

Edward Woodward suffered a heart attack in the summer of 1987. Accordingly, the producers needed to find a quick replacement while Woodward recuperated. Robert Mitchum was brought on as an old friend of Robert McCall, who helped McCall's son search for his missing father in the two-part episode, "Mission: McCall". Richard Jordan was also brought on as embittered former operative Harley Gage, and stayed for eight more episodes.

Edward Woodward was nominated for an Emmy for Outstanding Lead Actor in a Drama Series five years in a row even though the show aired for four years. The final two episodes were burned off in August 1989, which made him eligible to be nominated in 1990 for the 1989-1990 season. NOTE: Even though the show ran for four seasons, it started in 1985, and ended in 1989. Therefore, his nominations were for 1985, 1986, 1987, 1988, and 1989. A total of one nomination per year.

Melissa Leo guest-starred in one episode of the series. In 2014, she co-starred in the theatrical film adaptation of the series, with Denzel Washington in the title role.

According to William Zabka (Scott McCall), there were talks of a spin-off series with his character in the starring role, but it never materialized.

McCall drove a black Jaguar, New York license plate number 5809 AUJ.

Martin Shaw, who gained fame on the British series The Professionals (1977), turned down the role of Robert McCall on this show.

Twenty-five years after the series ended, Denzel Washington succeeded Edward Woodward in the role of Robert McCall in the film adaptation The Equalizer (2014), which was based on this show.

It is said that Edward Woodward's appearance in The Wicker Man (1973) gained him this role. He had previously played in Callan (1967), a British television detective show.

McCall's main weapon was a .380 Walther PPK/S. He also often uses a Desert Eagle Mark I.

The theme song for this show was written by Stewart Copeland, former drummer with the band The Police.

McCall's phone number is 212-555-4200.

Edward Woodward won a Golden Globe in 1987 for his outstanding performance in the series.

Arnold Schwarzenegger is a fan of the series.

This series was about Robert McCall, who became The Equalizer, as he set out to help people who have been wronged by New York City's dangerous criminals, as McCall seeks redemption for his dark deeds as an Intelligence Agent.