Revealing mistake: Most of the blood seen in this film is too light to be considered real human blood. In the public trap it is practically pink. The reason for this is the 3D effect. When watched in 3D, it looks more like normal blood. But in normal viewing, it does look too light.
Continuity mistake: Saw VII takes place straight after Saw VI. In Saw VI we see Jill put Hoffman in the bear trap and leave. We then see that Hoffman spends around 45 seconds trying to get the trap off before putting in the bars on the window. In this film however, just after Jill closes the door we see the glass break. No delay.