Dangar

Factual error: The depiction of lasers is completely off in the movie. While surgical laser is indeed a real thing, such a highly concentrated beam with enormous cutting power seen in the film would take industrial size instruments and an extremely high power supply. Also, a laser beam simply doesn't look that way. Those scenes are way off into science fiction for an otherwise raw and realistic-looking thriller.

Dangar

Plot hole: The arrangement of the traps in the barn assumes that Jigsaw foreseen the whole outcome of the game – which is impossible. For example, he made a tape and a complex, thematic trap exclusively for Mitch – but what if Mitch would have died during the very first trial or afterwards?

Dangar

Continuity mistake: As Anna and Mitch get trapped in the silo, various sharp and pointy tools begin to fall on them (a pitchfork, circular saw blades, nails, etc.), but when Ryan finally pulls the lever and the silo door bursts open, they all disappear. Only the wheat and the trapped duo can be seen "flowing" out.

Dangar