When Tatum goes out to the garage for beers, she pushes the garage door button, the light goes on, and the door goes UP. As the scene progresses, you never hear the door closing, yet when the cat knocks over the shovel, it runs thru the animal door of the CLOSED garage door. Also, after she knocks the villan down, she appears to push the garage door button again (although not actually shown) yet the garage door is still down. Finally, on a couple of shots of the knife, you can see it covered with blood, yet when the villan stands up to raise the garage door, there is no blood on the knife. Seems the blood comes and goes as it feels.