When Iris (Ruth Negga) first meets Foley (Samuel L. Jackson) in the dance club, Iris' hands were both initially positioned on her hips. Between shots, her hands are both down to her side, then back on her hips.
At the end of the movie when all the principals are in the building under construction, the black case holding a portion of Tom Wilkinson's cash goes from open to closed between scenes.
Near the end of the film, when Iris is shot and needs a blood transfusion, Foley tells the doctor to use his blood because 'it will work.' However, parents are not automatically compatible blood donors to children. They could actually have different blood types which are incompatible.