In the beginning montage when the boxer's head hits the mat, and you get a side view, there is blood coming from the ears. When the view changes to above him his head and neck are clean.
At the beginning, Thirteen asks Apple if she had a corneal transplant 5 years ago. A few scenes later when House tells the team to find out what cancer the donor might have had, it is said that the donor has been dead 4 years. He would not have donated his corneas a year before he died.
House tells a nurse twice to get him peppermint tea twice in this episode. However, in the episode Resignation (2007) House states that he hates tea.