Watching the Talking Dead, Nick, the director pointed out the Bloated Zombie Rick killed was so full from eating Lori. Everybody's jaw dropped. I had not thought about that.

That was the first thing I thought of. I thought it was pretty obvious with the blood drag marks down the hallway that it was her and then when Rick was debating whether or not to cut up the Walker's stomach was the drive it home to the viewer that it was Lori inside.