The scene where the "witch" flies out of the cargo compartment on the airplane took several takes. The actor couldn't easily open the cargo door on the B707, so actual airline employees were used.
When Julian Sands received the script, he assumed it was in the mold of the then-popular slasher movies, so it sat around for a while before he got around to reading it. Once he finally decided to give it a once-over, he was captivated and quickly became excited about the film.
Screenwriter David Twohy's original conception was that the Warlock was a good-natured man who fled the 17th century to avoid religious persecution, only to find himself similarly persecuted in the 20th century. After working on the script for two months, he realized it didn't work and decided to make the character a villain.
The fate of the unbaptized male child was intended to be shown but was ultimately deemed to be too gruesome.
In 1990, then newly-founded Trimark Pictures bought the distribution rights from the bankrupt New World Pictures and also purchased the rights for any potential sequels.