During the erotic scene that follows the removal of the characters' clothing, a yellow ghetto blaster can be clearly scene on a table in the background, despite the fact that the plot required all electronic things to have been thrown out of the cabin in one of the previous scenes.
There is a vase of flowers on the living room table during the "We have to stick together" scene that follows the discovery of Larissa's body, despite the fact that they were not present in the scene before.
In one of the early scenes, Natasha grabs a beer from the fridge and we can see that the tops of the remaining beer bottles had already been removed.