Nowhere near as much of automotive manufacturing is as automated as people think. Fitting panels etc is often a robot assisted job but not 100% machine. During production trials for new cars ALOT of time is spent trying to get the panels to fit together correctly, even getting the doors to seal correctly and be water proof isn't a given to begin with.
Indeed. I once temped at a car plant where I wore chain mail gloves to manually remove body panels coming out of the die, place them on a cart, and spot check a random sample for defects.