Trivia: In the film, Amanda Peet plays Darcy Silverman. Peet also starred in the movie "Saving Silverman" as Judith who was engaged to the character Darren Silverman. Jack Black (Gulliver) also starred in "Saving Silverman"
Trivia: The runes on the grate say "be afraid" in Elder Futhark.
Trivia: The scene when Ramona delivers the package to Scott and he signs for it, he takes the package and throws it over his shoulder into the trash can, some several feet behind him. In the outtakes reel, they show that no special effects were used. Michael Cera made the shot over his shoulder on his 33rd attempt.
Trivia: At the beginning of the movie, Olive wonders why her life can't be more like an '80s movie, including Sixteen Candles. In the car with Todd, when they're - SPOILER ALERT! - talking about kissing each other, the song playing in the car is a rendition of "If You Were Here," the song playing near a similarly romantic scene in Sixteen Candles.
Trivia: Originally, Kevin Greutert, who edited the first five "Saw" movies and also directed "Saw VI" and "Saw 3D," was attached to direct. However, Lionsgate enacted a contractual clause to remove him from the film. While an exact reason was never given, it has been widely speculated that this was done because the "Paranormal Activity" movies were the only direct competition for the "Saw" series at the box office.