In a rare instance, Darrin calls Gladys Kravitz by her first name.
The American Civil War Centennial commemorative activities began in 1957. The issuance of a postage stamp in April 1965 marked the end of the celebrations. This episode was filmed on July 21, 1965.
Although perhaps there is an album titled 'And Then I Wrote' (the first recorded by country singer Willie Nelson in 1962), there is absolutely no evidence that this title has anything to do with that, considering that this episode doesn't make any references to that singer. This is simply a common expression---often used by writers---and Samantha here becomes a writer.
Tom Nardini (Indian) also played a Native American character in the films Cat Ballou (1965) and Africa: Texas Style (1967), which presented the risk of being typecast in all his roles.