Both this episode and Samantha's Old Salem Trip (1970) feature Samantha being sent back to Salem in the 1600's, not by her choice, and Darrin being accused of witchery and taken to court.
The match was accidentally invented by British pharmacist John Walker in 1826 over 200 years after the original Thankgsgiving in 1620.
On October 31, 1939, President Franklin D. Roosevelt signed a presidential proclamation changing the Thanksgiving holiday to the next to last Thursday in November, for business reasons. This episode's first airing was exactly on the fourth Thursday of November 1967.