Factual error: When House is looking over his whiteboard of symptoms for the swimming patient, the symptom "Intercranial Hemorrhage" is shown on the board. However, this is an error. The correct term is "Intracranial Hemorrhage." Anything inside the head is referred to as "intra" not "inter." This is a common mistake for laypeople, however the highly trained and knowledgeable Dr. House should not have made that error.
Continuity mistake: When the young swimmer is about to dive, you get a close-up of both her heels going over the edge. Then, it shows a further shot with only one heel over the edge. Later in the same scene, the girl is underwater and you see her hair flowing around her face. When she lifts her head out of the water, her hair is tied up.
Audio problem: When Foreman comes to inform the patients parents that the surgery to relieve inter-cranial pressure was successful, the mother asks "What happened? Did she hit her head at a meet or...?" The coach's audio responds with, "No, nothing like that," but the words don't correspond to his mouth movements.