Towards the beginning of the show, we see the porch light fall right on top of Herman Munster. However, we can clearly see it's a stunt double, not Fred Gwynne, who's hit.
Herman: Why does this have to happen every time I come home?
Lily: Well, Spotty was out back, playing in the quicksand, and when Eddie went to school he left the door open. Well, Spot got in and tracked mud all through the house.
Grandpa: Hmph... In the old country, our pets were never allowed in the house. They hung on the wall of their cave, where they belong.