Trivia: Spoilers. At one point, the two pig masks that assist Gordon were supposed to be Brad and Ryan from the opening public trap. This was related to the original ending, in which it is revealed that a number of the survivor's group members have been assisting John and Gordon with their work, behind the back of Hoffman. However, with this idea having been dropped, the identity of the two pig masks has now been left up to the imagination of the viewer. After the release of Jigsaw in 2017, it is revealed that John has another apprentice, Logan. Logan is of similar build to one of the pigmen and is quite possibly one of them.
Trivia: Although this was originally intended to be the final film, less than two years later, Lionsgate was already looking to continue the series. However, it wasn't until six years later that an eighth film was finally confirmed.
Trivia: David Hackl, who has previously directed "Saw V", was originally contracted to direct this film. However, 2 weeks before filming began, he was fired and replaced by "Saw VI' director Kevin Greutert. While no official word was given, it has been heavily suggested that this was done for two reasons. First, because Greutert's "Saw VI" was the highest-rated "Saw" film critically after the original. And second, because he was set to direct "Paranormal Activity 2" for Paramount, and it was going to be a direct competitor with "Saw 3D" at the box-office, thus causing the studio to rehire him to spite "Paranormal Activity 2's" production.
Trivia: Originally, an eighth and final "Saw" film was planned for 2011 before "Saw VI" hit theaters. When "Saw VI" didn't fare as well at the box office as previous entries, producers decided to scrap the eighth film and end the series with this movie, the seventh film. Writers Patrick Melton and Marcus Dunstan had to combine the scripts for "Saw VII" and "Saw VIII" to make this film the end of the series. Ironically, they had to do just the opposite with their "Feast" film series just a few years prior- their script for "Feast II" was cut in half, and expanded to also allow for a "Feast III."
Trivia: The "teeth pulling" trap is based on a trap from an early draft of "Saw IV." The lead character in the early draft (Detective Mathews from "Saw II", later replaced by Officer Rigg in the final draft) was forced to pull out all four wisdom teeth to find the code for a doorway. (As opposed to the two teeth Bobby must extract in this film.).
Trivia: The filmmakers had several times in the past tried to convince Cary Elwes to reprise his role as Dr. Gordon from the original film for previous entries. Elwes was finally persuaded when he realized this would be the final film, and that his character's return would be important to the story in the end.
Trivia: The "Horsepower Trap" (the car trap involving Even and his friends) was an idea that writers Patrick Melton and Marcus Dunstan have tried to get into several "Saw" films before, only to be told by the producers that it was too gruesome and cruel. Knowing this was the intended final film, the producers finally allowed them to include the scene.