Arrow on the Doorpost - S3-E13
Question: How can Hershel be driving without his lower right leg?
Answer: Since the show is set in America, it's likely to be an automatic gear shift, so while it would be uncomfortable and take a lot of getting used to, Hershel would be able to drive with his left foot working both the gas and the brake.
Question: When Andrea escapes the Governor by releasing the stairwell of zombies on him, it does not look like she is actually hiding behind the door but that she is in the actual stairwell where the zombies are or in a different room. Some insight into this would be much appreciated.
Answer: When the governor walks towards Andrea she opens the door that's filled with the walkers, she goes behind the door while leaving the governor to fight off the walkers.
Answer: She is behind the door.
Answer: Because he had a prosthetic leg .