In late 1965, Dorothy Malone only had to be on the set two days a week. She was quoted saying: "I've never worked so little or had such an easy job."
In the opening credits, the last name of the characters played by Dorothy Malone and Mia Farrow is spelled Mackenzie. In the original novel by Grace Metalious and the 1957 movie, the last name is spelled with a capital K (MacKenzie). There are no reports from the creators on if the name was spelled in the TV series on purpose or by accident.
Also available in a computer colorized version.