Continuity mistake: After being sprayed in the face with water while tied up in the basement, the next shot shows Butch and Marcellus Wallace having no water anywhere surrounding them on the ground.
Continuity mistake: When Butch crashes and Marcellus shoots the woman, there's a second woman next to the door, and a white cup next to her. In the wide shot the cup is gone.
Chosen answer: Tarantino is big on tribute to older films and filming techniques, hence the projection-style background.
Captain Defenestrator