Bill Mumy was the original choice for Eddie Munster, but his parents didn't approve of the extensive makeup that would be used for his character. He would eventually guest on The Munsters: Come Back, Little Googie (1965), playing an incorrigible brat, during the first season.
Grandpa, if you want the ketchup, just say "Please pass the ketchup", not "Shoot me the plasma!"
The Munsters regard their niece Marilyn (who looks like the ideal beauty of non-monster people) as ugly and deformed, yet everyone else in the town of Mockingbird Heights basically looks like Marilyn. The Munsters also watch movies and regard then-popular stars such as Frank Sinatra and Rock Hudson as ideal men, and Grandpa's beauty potions always conjure up a beauty who looks something like Marilyn. Shouldn't their concept of beauty be horrible monsters, in accordance with the premise that Marilyn is an ugly duckling? Nor do the Munsters seem to be aware that they look radically different from non-monster people, despite interacting with them on a daily basis.
In the un-broadcast pilot The Munsters: My Fair Munster: Unaired Pilot (2004), Nate Derman, who played Eddie Munster, is listed in the opening credits as "Happy Derman."
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