Denzel refers to character Miles Whittaker as "Yummy" This is reference to Robert "Yummy" Sandifer who was an American street gang member from Chicago. He was only a child (believed to be 11) Sandifer's murder by fellow gang members in Chicago garnered national attention, resulting in him appearing on the cover of TIME magazine in September 1994. MT
Principal photography on the film began in the South End area of Boston, Massachusetts, on September 14, 2017. Filming also took place on Lynn Shore Drive in Lynn, Massachusetts, as well as in Brant Rock, Massachusetts.
While Sony and other publications reported the film was made on a net production budget of $62 million, Deadline Hollywood stated their sources insisted the cost was "in the high ($70 million)" range after Massachusetts tax credits.
Similar to the first film, this sequel also utilizes a gratuitously-bearded henchman who is ex-military and/or has CIA assassination training which was played by Garrett Golden. In the Equalizer (2014), the character was played by Tait Fletcher.
When Robert McCall pulls Miles out of the gang apartment building, they reach the lobby and then McCall pressures Miles to shoot him to validate Miles' decision to join the gang. McCall says "It's only five pounds of pressure" - This is factually correct since 1911 pistols (being single-action pistols) are known for their light trigger pull as well as their century-old battle tested reliability.