- Big fan of Vincent Price, Roger Corman and Edward D. Wood Jr.
- Close friend of Vincent Price
- Strong supporter of gay rights
- Sometimes credited as "Cassandra Petersen"
- First woman who did a music video in 3D ("Superstition")
- Favourite movies: Plan 9 from Outer Space (1959) and Attack of the Killer Tomatoes! (1978).
- #1 of Sci-Fi's Sexiest B-Queens, by Femme Fatales magazine 
- Owns a production company in Los Angeles called Queen B Productions. She merchandises Elvira products.
- Pentagon named a Stealth computer system "Elvira" inspired by her.
- Strong supporter of animal rights
- Attended Palmer High School, Colorado Springs, Colorado; graduated in class of 1966.
- Once was a complete vegetarian, now eats dairy plus chicken and fish.
- Daughter, Sadie born. 
- In 2002, she licensed the name and likeness of "Elvira" to International Game Technologies for use in an Elvira-themed video slot machine.
- In 1996, she licensed the "Elvira" name and likeness to Midway Manufacturing (a division of WMS Gaming) for the "Scared Stiff" pinball game.
- Measurements: 34-21-34 (Source: Celebrity Sleuth magazine)
- Has hosted the Halloween themed Knott's Scary Farm amusement park in Buena Park, California from 1982 - 2001.
- Was scalded by boiling water when she was five years old. Underwent seventeen skin grafting operations over the course of her childhood to repair the scar tissue. Now covers some of her remaining scars (around neck and shoulders) with make-up or clothing.
- Is a natural redhead.
- Although she has appeared in nude layouts, she has never appeared nude as the Elvira character.
- Maila Nurmi, the original Vampira, unsuccessfully tried to sue Cassandra Peterson for stealing her act.
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