Jennifer Garner trained for months in MMA fighting, knife fighting, and how to handle firearms to prepare for her role in the film.
After breaking into Peg's home, Riley steals a Maxi-Pad from her bathroom medicine cabinet and uses it to cover her bleeding wound. In real life, the pad was originally designed for injuries and wounds, as it could soak up blood and not leave messes, before it was rebranded as a feminine hygiene product.
Shauna Duggins, Jennifer Garner's long term stunt double and friend, once again worked as her double for this film. Their working relationship spans 19 years.
Amputees were used for the henchmen who have a leg and an arm broken by Riley North.