- When running a thrill-kill-for-profit organization that involves kidnapping tourists, it is best to nab just one or two members of a group at a time, allowing their friends to get suspicious and spend a day or two investigating (and potentially talking to and frightening away some of the other guest/victims at your Hostel of Doom), rather than just grab all of them at once. This is true even when there is a steady flow of paying customers coming through, requiring a constant supply of victims.
- A sadist whose motivation is ostensibly his frustrated desire to be a surgeon nevertheless includes power tools as well as surgical tools in his torture repertoire. Nothing satisfies that urge to perform delicate surgery like ripping through someone's shoulder with a power drill.
- A chainsaw which has been dropped to the floor will cut entirely through a man's thigh underneath it, even though all the weight of the chainsaw is at the back where the motor is, not in the blade, leaving a good few inches between the blade and the floor when the saw is at rest.
- An enterprising sadist could actually make money by purchasing (non-American) victims through "Elite Hunting", harvesting all their transplantable organs, and re-selling them on the black market. According to this article, one kidney alone would fetch enough in Turkey to cover what this organization supposedly charges to let you kill a Russian. Anything you can get for his other organs is pure profit.
- Despite this, if you operate a business like "Elite Hunting", you should just have your cleaning crew incinerate the bodies, valuable organs and all, rather than attempting to extract all possible profit in return for the enormous risks you're taking.
- Eastern Europe is plagued by vicious gangs of small children, who will cheerfully beat several gun-wielding grown men to death in exchange for a sack full of chewing gum.
- The optic nerve is actually a tube containing some sort of disgusting yellow pus, which will squirt out when it is cut.
- In Slovakia, Asian women with half their face freshly burned off are apparently so common, they don't attract so much as a curious sideways glance from passers-by.
Things I Learned from Saw II
- Serial killers whose M.O. involves elaborate deathtraps might, just might, have some elaborate deathtraps in place protecting their lair. The police in this film learned this particular lesson the hard way. Apparently it hadn't occurred to them before entering the building to be watching out for that sort of thing.
- There exists a slow-acting nerve gas whose operation is so predictable, a timer can literally count down how much time remains to anyone breathing it. This gas also causes internal hemorrhaging, despite being clearly referred to as a nerve agent.
- If I should ever find myself with one arm stuck in a box with razor-sharp blade flaps arranged in a one-way door configuration, I will simply hold the razor flaps open with my other hand and pull my arm out, rather than inextricably trapping myself by sticking my other arm into the other one-way razor door in the box. Especially if I have already spilled the life-saving nerve gas antidote that was inside the box.