Over 150 paintings were contributed by Clive Barker (mastermind behind Hellraiser and Candyman) to use for the show.
The Weird Sisters are a trio of Witches in the Shakespeare play Macbeth. The spell Sabrina uses to summon them is taken directly from actual lines spoken by the witches in Macbeth (Act 1, scene 3).
Aunt Zelda appears to be fluent in at least a dozen languages, including French, Italian, Russian, Japanese, Spanish and German, as shown by the newspaper she is reading at the kitchen table on each episode.
Stolas, Wardwell's familiar, is neither a crow nor a raven but a hybrid of two birds, combining the size and proportions of a raven, yet retaining the beak shape of a crow. The visual effects crew refers to Stolas as being a "craven".
In Sabrina's bedroom there is a poster of the movie Haxan (1922). It's a Swedish/Danish documentary style film on witchcraft through the ages.