- The Danza: Jennifer Connelly as Jennifer Corvino
- Executive Meddling: Was edited down and released in the United States as Creepers, which wasn't well-received. The Director's Cut was released on DVD to better acclaim.
- Hey, It's That Guy!:
- Donald Pleasence (Dr. Loomis, Blofeld) as Prof. McGregor.
- And a somewhat lesser-known example in Michele Soavi, who plays one of the detectives near the beginning of the movie and would go on to direct his own films, the best known (and arguably the best, period) probably being Cemetery Man.
- And let's not forget the other detective, the inspector Geiger, who is actually dear Patrick Bauchau (Sydney in The Pretender).
- Reality Subtext: Argento's own mother abandoned the family after a phone call from her paramour, just like Jennifer's.
The Book Series
- What Could Have Been:
- The book series was supposed to become Picture Books instead as Eliassen was mainly an illustrator, but Gyldendal wanted it to be more mature looking so he could only draw the covers and book part illustrations. Later it did get picture books but these were drawn by Řystein Runde which provided very different artwork for the characters compared to their Canon counterparts.
- The 7th book was aparently going to be released much earlier than November 2011, but due to the terror attack did Eliassen wait as he couldn't bring himself to bring fan favorite Ilke's death that close to when so many had at least lost one friend around her age, more death.