Near the end of the film, with Renata taped to the chair, a rear shot shows Bill reaching for a bottle of whiskey and a glass. From the rear shot you can hear him pouring whiskey into the glass. As the shot changes to frontal, he pours again into an empty glass.
When Bill Guerrard is shown in Renata's office at first, his suit jacket is blue. But after getting shot in the face, he is seen on the floor and his suit jacket is black. Then when Bill Guerrard gets up after not being killed, his suit jacket is blue again.