If there is a magnet decal then it's there to cover burn damage. Not standard at all.
With regard to factory mylar:
Quoted from sc204:From the factory there was a piece in the pop bumper area and I believe one in front of the graveyard scoop.
Full playfield mylar was available separately. Mine has the full playfield mylar but it was applied some time after being in service in response to early signs of mansion insert wear. Mansion inserts commonly become raised/dropped which creates unevenness that is exacerbated by mylar.