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When Sam is injured in the hospital, the PA says, 'Dr. Davis, telephone please. Dr. Davis, telephone please." This is an old hospital sound effect found on a unidentified sound effect album, that is very common in use for background effects. It's also famously found at the beginning of the 1988 album Operation: Mindcrime by Queensrÿche, in the opening of 'T.nT.' by Motley Crue (1989), and 'Catapult' by Phish (1992), as well as being recognized in many other TV shows and movies.
In Cyrus's warehouse the arcade game Robocop can be seen. A parallel movie where the city is in chaos and anarchy looking for a beacon of hope.
Samaritan has numerous characters played by actors wearing makeup to give them the appearance of being heavily tattooed. Sylvester Stallone, who actually is tattooed over his chest and upper arms, wears makeup to play a non-tattooed character.
The city used in the opening monologue is Rochester, NY.
This is the first time in a film that we get to see Javon 'Wanna' Walton's boxing background put to use.