The first season opening credits were an outrageous parody of the opening credits of La famille Stone (1958), which always began with Donna Reed lovingly passing out lunches to her departing family members as they left the house one by one. Yvonne De Carlo, as Lily Munster, did the same thing.
The show was shot in black and white because the studio did not want to pay an extra $10,000 per episode for color.
Whenever he gives his birth country, Grandpa always says he was born in the Holy Roman Empire. According to Bram Stoker's 1897 book, Dracula was born in the Holy Roman Empire in modern day Romania.
Beverley Owen, who played Marilyn Munster in the first 13 episodes, is a natural brunette. She wore a wig, and her hairline was often covered up by a headband. Pat Priest, who played Marilyn for the remainder of the series, is a natural blonde, so that is her natural hair.
There was only one Drag-U-La (Grandpa's coffin car) built for the show. At one time it hung from the ceiling in Planet Hollywood in Atlantic City. It was restored and resides somewhere near Orlando, FL. There have been several replicas built since.