House

Right after House injects the large hostage with the sedative and he collapses, Jason racks the slide on his pistol and no round is seen being ejected from the chamber. While this action is used frequently in TV and movies for dramatic effect, it is somewhat ridiculous given that 1) the action in essence wastes one round of ammunition as the round that was in the chamber is ejected and a new round from the magazine is loaded or 2) as in this case, no round was ejected thus indicating that the weapon was essentially useless up until that point.

House notes that everyone in the room is sick except for him so nobody else should be injected with propofol. However, Nurse Regina is a staff member, not a patient. House doesn't volunteer her and Jason doesn't notice despite the fact he's the one who brought her in.