The first season opening credits were an outrageous parody of the opening credits of The Donna Reed Show (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.
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.
Beverley Owen played the part of Marilyn for the first 13 episodes. She was in love with her fiancée in New York and agreed to do the show thinking it would be a flop from the outlandish premise. When it became a hit, she was constantly crying from having to be in LA while her boyfriend Jon Stone was in New York. The other cast members asked the producers to release her from her contract so she could get married and they did. She was replaced by Pat Priest, who looked so much like Beverly Owen, viewers never knew the difference. Beverley Owen would get divorced from Jon Stone eight years later, and would never appear on screen again after those initial 13 episodes.
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.