Ground wired to neutral in light switch
Nope. Get the ground wire outta there! (out of the neutral splice). There should be a ground wire from the bottom of the switch hooked on a green ground screw and tied to the ground(s) in the box, nutted with a green nut. The neutral splice should only consist of neutral wires and the ground wires should all be tied together with a green nut. Wire colors can't be mixed in most cases.
Would like to know if home was recently built before the postscript question?