In the scene where PSO's Kent and Don do a pit maneuver on an old man that is wheelchair bound (and has no legs), Kent then gets out of the squad car, head butts the old man and begins to slap him repeatedly. As this was happening, residents called the police because they thought it was real. Shortly afterward, an actual police officer came by to investigate, when he saw that it was a scene being shot, he laughed and then drove off.
In the scene where the character Kent Read (Danilo Mancinelli) is twirling his gun and then goes off is original; there was no editing done. Actor Danilo Mancinelli taught himself different gun maneuvers to prepare for the role of Kent Read.
Filming took over 6 months due to the exhausting demanding action and fight sequences that the character Kent Read was involved in.