Factual error: In the scene where Mark is describing to his friend, Josh, how he knew about the bet from the beginning, and how he foiled Andreas plan by disconnecting the camera, he states that he did this by unplugging the "Tv Feed," or RCA cable, from the camera. This would not stop the camera from recording as they state it does.
Continuity mistake: In there scene where Mark is stripping for Andrea, there are several instances where his pants are down, with his boxers showing, then back up, with belt buckled, then back down again. This happens many times through this scene and is blatantly obvious.
