When Lalaurie's Zombie daughter has her throat slit and then stabbed to death she doesn't bleed - dust comes out. When Zoe attacks the other zombies, they bleed. Also - beforehand - zombies were shot repeatedly and it didn't phase them but one stab from Lalaurie and killed.. How do you kill the dead and how do they squirt blood?
The mother of the stillborn baby in the hospital, despite just having given birth that day, has a noticeably flat stomach. This is physically impossible.