Blomkvist is shown behind the wheel of a Toyota Prius. When he switches it on, there's the customary start-up roar you would expect from a larger car, whereas a Prius normally starts up silently.
After reporters harass Miriam Wu at her door, she walks back through the flat and a boom microphone can be seen reflected in a mirror on the wall.
At the beginning of the film, while Lisbeth is in the Caribbean, the dragon’s tail in her tattoo extends below her tan line. Later, when she is with Miriam Wu, the tail stops a couple of inches above that tan line.
When Lisbeth is re-experiencing her nightmare about Dr Teleborian, she is lying on her back. A close-up of her foot, however, shows it positioned as if she were lying on her front. The shot then returns to her face and she is once more lying on her back.
The knot in the leg of the piano differs in form and placement from shot to shot.
When Lisbeth visits Bjurman's house and is confronted by two thugs, the surrounding vegetation is rich and green, implying late spring or summer. Yet when she reaches Zalachenko's farm, reportedly only a day or two later, the foliage is a vivid yellow and orange and their breath can be seen in the air, suggesting mid-autumn.
When Salander presses her Taser to the fair-haired giant's crotch, he does not even twitch. Although he is incapable of feeling pain, the electric current would still make his muscles contract involuntarily, producing spasms.
On at least two occasions Lisbeth uses a stun‑gun on a man whilst she is touching him. Her body would thereby complete the circuit, sending the voltage through her as well, yet there is no indication that she is ever shocked.
Once buried for several hours, one cannot dig oneself free from a grave — there would be no breathable air for that entire period.
While Blumkvist is looking through Lisbeth's post, the PO Box number on the form is shown as 24914, yet the box he actually opens is numbered 17228.
When Lisbeth gains unauthorised access to Bjurman's computer, she finds an e-mail confirming an appointment to have the tattoo on his stomach removed on Friday 7 November 2009. In 2009, 7 November was a Saturday.
When the Giant sets the barn alight, Miriam smells the smoke and awakes after a beating; in truth, the fumes will put to sleep even those who are merely asleep and have not been rendered unconscious.
Niedermann's driving licence, as shown on his car hire agreement, is listed as valid from 2005–2015. German driving licences issued at that time did not have a time limit on their validity.
Whilst Michael is in Lisbeth's flat and perusing her old file, the text behind Lisbeth's photograph is clearly "lorem ipsum", the nonsensical filler text commonly used as a placeholder in typesetting and design.
The MacBook laptops in the film are plainly switched off, as the Apple logo on the back of the lid would normally illuminate when the machines are turned on.
During Lisbeth's childhood flashback, a burning Zalachenko tumbles out of the car and lands beside the spilled "petrol" that splattered when Salander hurled it onto him, but it does not catch alight.
(at about the 20-minute mark) After shopping, as Lisbeth walks home along "söder", the sun is setting behind her, yet her shadow is cast to the rear left.
