Deliberate mistake: Bowser has several teeth that appear and disappear throughout the movie. The best example of this is when Mario is trying to grab the Power Star. We see Bowser snarl at Mario before he picks him up. There is a gap between his two front teeth. However, when the scene cuts from Mario's horrified face to Bowser's face, there are now extra teeth inside that gap.
Deliberate mistake: Per his autopsy in Saw IV, John Kramer was 52 years old at the time of his death, and this film takes place between Saw and Saw II. Tobin Bell was around 80 years old at the time of making this film, and thus looks far too old to convincingly play someone in their early 50s. Amanda Young also looks a lot older in this film compared to other entries in the franchise that are chronologically later.
Deliberate mistake: While the events depicted in the film take place over nearly a decade and a half, the characters are not shown as having aged at all throughout the film, apart from Mike Lazaridis. In fact, characters are seen wearing the same clothes and the same ties between scenes that are set years apart.
Deliberate mistake: Kristin would not be physically able to hold Fabrizio from falling over the ledge using only one hand/arm (or even both). (01:30:22)
Deliberate mistake: The ghost opens Nikolaj's bedroom door an inch or so, yet there is enough light emitting onto the hallway floor for the door to be open about halfway. After the door closes, the light on the floor continues to gradually fade towards the closed door. (00:17:05)
Deliberate mistake: Candy tells her radio listeners, "Our phone number is 201-5137." Assuming the radio station's reception extends beyond more than a small geographic area, an area code is needed for callers outside of the immediate area. On Ellie's cell phone, Mary's number shows up with an area code. (00:05:55 - 00:07:20)
Deliberate mistake: When they're watching the footage of the tsunami hitting Cannon Beach, Sabrina turns the TV off as the shot pulls backwards. Suddenly, the glare on the TV appears out of nowhere.
Deliberate mistake: A car plummeting 10 metres off from a plane, landing on two cars as if they were a pair of soft gymnastics pit mats, just to keep on driving without a single scratch - let alone a mechanical breakdown or the blowing up of a tyre - defies all laws of physics and common sense.
Deliberate mistake: Ryan was cooking venison (deer meat) in a pan over hot coals. He speared a piece with his knife and held it up for his young son, Billy, to take, which Billy did with his fingers. But did not get burned or show any signs that the meat was hot. Billy was even able to take a bite of the meat. The meat could not have cooled off that fast, even outdoors in jacket-wearing weather. (00:07:04)