When Sue picks up the movie poster, French makes fun of him for playing a Ninja back in the day. Scott Adkins played a ninja in two previous films.
The line tattooed to the women's leg at 17:41 into the movie; "She's mad but she'e magic/there's no lie in her fire", comes from the poem, 'An Almost Made Up Poem' written by Charles Bukowski.
The sandwich restaurant that Sue and French visit in the movie is later seen at a distance as they are staking out Amanda as she's shopping, on the way to the Irishman's apartment. The name of the restaurant is the Oinkster, located on Colorado Blvd outside of Maywood, L.A., California.
Tommy and Sue joke about French driving on the opposite side of the road. However, at the 1:03:42 mark, they are actually driving on the opposite side of the road as in the U.K.
Jesse V. Johnson made 8th Movie with Scott Adkins. (Till 2021)