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Jessica is suspicious when the appearance of the ghost of a long-dead witch burned at the stake coincides with the release of a book on the very subject.
Dee Wallace and Christopher Stone were married at the time of filming.
The title is based on the three witches' dialog in Shakespeare's 'Macbeth' (Act IV, Scene I): "Double, double toil and trouble; Fire burn and cauldron bubble."
1 of 48 times Dee Wallace and Christopher Stone, Stone appeared together on screen, all but 1 while they were married in real life.
Twenty people were accused of witchcraft and put to death. Nineteen people were hanged and one was pressed to death. No one was burned for witchcraft in the USA.
Jessica (Angela Lansbury) states that you don't get jet lag when traveling west-to-east. This is untrue. Jet lag is present in both east-west and west-east travel and is worse for those traveling west to east.
Angela Lansbury as Jessica Fletcher
Ron Masak as Sheriff Morton Metzger
Christopher Stone as Adam Frobisher
William Windom as Dr. Seth Hazlitt
Juli Donald as Irene Turhune (II) / Annie Gorman
Brad Dourif as Dr. Warren Overman
Bill Maher as Rick Rivers
Roddy McDowell as Gordon Fairchild
Russell Nype as Reverend Trevor Fordyce
Dee Wallace Stone as Mildred Turhune
John J. York as Jonas Holt