Happy Valley Lodge's area code '416' corresponds to a phone number geographically located in the city of Toronto, Canada, and was one of the 86 original area codes introduced in 1947. Since the Munsters live in California, it would be highly unlikely that they could drive there and back in a weekend.
As lily is driving with herman, her hands just move around the steering wheel. the spokes of the wheel do not move at all as she does this.
Herman refers to Dr. Victor Frankenstein IV as an "English guy." Frankenstein, however, is German.