Corrected entry: When Stuart has Beth chained to the chair, the position of the chains around her keeps on changing between shots.
Corrected entry: When Paxton's girlfriend finds his decapitated body, there is nowhere near enough blood around for someone who just had his head cut off.
Correction: This is because he was decapitated earlier and layed into this position. He probably lost most of his blood prior to being set up. If he was decapitated sitting at the table, his girlfriend would immediatly have woken up.
Corrected entry: During the opening scene, the guy lying in the bed is hooked up to a medical monitor that states "DEMO" in the middle of the screen. Equipment must have been running in demo mode.
Correction: I just watched this scene, and the moniter (a heart-rate moniter to be specific) does in fact not say "Demo" anywhere on it.
Corrected entry: When they are all hanging out in the lovely spa area with the Slovakian "hottie" rubbing moisturiser on the girl's back and stuff, they are all meant to still be in Slovakia. That spa is actually in fact The Blue Lagoon, found in Iceland.
Correction: The spa is not identified by name in the movie, and different locations are constantly substituted for others to make the scene work, to set mood, or simply because one location looks better than another.
Corrected entry: Throughout the movie the Euro currency is used, such as checking into the Hostel, they are told that the price is 10 a night, when at the Harvest Festival the items for sale are priced in Euro. Slovakia does not use the Euro Currency, they use the Slovak Koruna.
Correction: Russia uses rubles, yet, it is possible to find things priced in US dollars or Euros (now that the US dollar is less valued than the Euro) all over the larger cities. Officially, everything in Russia is supposed to be priced in rubles, but practically, most places will accept other currencies as well.
Corrected entry: Towards the end of the film when the rich American is set upon by the dogs in the lift, the background of the lift is green fabric. When the doors reopen, the metallic background is now visible.
Correction: The background is metallic the whole time. Though there is some green/white light coming through the ceiling, the background never changes.
Correction: With Beth jerking around while screaming and pleading, it's not surprising the chains would move. Stuart arrived to find her already chained, and never tightened them, so who knows how tight Beth's captors had chained her. They probably want to have some limited movement so that the torturers could derive some pleaseure from seeing the victims squirm.