- Ascended Fanon: For years, it had been a fan theory that the man limping and putting the key behind Michael's eye in the video shown in Saw II was Lawrence Gordon. Fans also seemed convinced that he assisted in other traps that required medical knowledge. In Saw 3D, this became canonical (despite director Kevin Greutert's original desire to have him get revenge against Jigsaw and his accomplices).
- Billing Displacement: While the series was already known for top-billing Tobin Bell in most movies after III, the displacement is taken to ridiculous lengths in this movie, where:
- Bell is top-billed in spite of his character having a screentime of only TWO MINUTES.
- Costas Mandylor and Betsy Russell get second and third billing, respectively, even though the former's character is barely seen until the end, and the latter's, while having more screentime that Hoffman, doesn't do a heck of a lot. Their billing can be pinned on them having become staples of the series at the time, having appeared in every film since Saw III up to this one, rather than their roles in the plot.
- Cary Elwes' character appears in three scenes and has four lines of dialogue, yet he's billed above Sean Patrick Flanery, who, at fifth billing, plays the main "hero" character Bobby, who has the most screentime of anyone in the film.
- Chad Donella, who plays the movie's main cop Gibson, doesn't even make the top five or the poster billings.
- Several actors who played minor victims in the movie, such as Chester Bennington (Evan), Naomi Snieckus (Nina) and Rebecca Marshall (Suzanne) have received billings as well.
- Executive Meddling:
- The movie's storyline was originally going to be shared between two movies, the second one being centered around what Gordon did over the course of the previous movies as an accomplice of Jigsaw. Due to meddling after the lower box office results of Saw VI, the two planned movies had to be condensed into one.
- A massively cunning, yet very dickish move by Lionsgate and Twisted Pictures happened two weeks before the shooting of Saw 3D began - they contractually forced the director of Saw VI, Kevin Greutert, to return and direct Saw 3D while having David Hackl, the original director who previously directed Saw V, shifted over to a yet-unconfirmed Lionsgate movie. This was because Greutert was originally set to direct Paranormal Activity 2, which was scheduled to be released on the same date as Saw 3D in a similar situation to how the first Paranormal Activity film contended with Saw VI in 2009. Needless to say, both Greutert and Hackl didn't take that move very well.
- I Knew It!: In Saw 3D, it's revealed that Dr. Gordon survived the first film and had been disciple of Jigsaw working behind the scenes since then. Some fans theorized this originally based on a brief part of the video shown to Michael Marks in Saw II. A cloaked figure with a limp (assumed later to be Jigsaw) is seen next to an operating table. Saw 3D reveals that this WAS in fact Dr. Gordon.
- Promoted Fanboy: Chester Bennington was a huge fan of the series long before he got a role in this movie.
Trivia / Saw 3D