When House pulls the toy policeman from the baby's nose, it has a base attached to its feet and is covered in the baby's mucus. When he holds it up to the baby's brother, it is missing the base. When he sets it down on the table, it has a base again and is no longer covered in mucus.
When House discusses the transplant debacle with Foreman, the latter wears the blue shirt he wore in the scene immediately preceding. A few seconds into this scene, he now wears a green shirt matching his necktie, which has not changed, and as House walks away, the view of Foreman from behind shows the blue shirt again. As Foreman turns around, he has gone green a second time.
At the end of the episode when Dr. House tells Dr. Wilson that he must fire someone from his team, House enters the diagnosis room. The board in the room has some things written on it. In the next shot, the board is clean with no time for House to have cleaned it.
At the end of the episode, before House enters the conference room, Dr. Chase is holding his head in his hand. When the angle changes, he isn't.
After House removes the toys from the child's nose, all of them are covered in snot, something House comments on the first time. But each time, there's a closeup of him putting the toy down on the counter straight after removing it. In these follow-up shots, all the toys are completely clean.
When House checks out the Corvette that has been left in the garage, he describes it as a '65. The indentations behind the front wheels indicated that the Corvette was a 1963 or 1964, but not a 1965 model. The 1965 had vertical slats behind the front wheels.
The 1963 model had grills built into the hood, but the camera angle makes it impossible to determine.
When House holds up the quit-smoking candy, it is actually written in Japanese. It is not a Chinese candy but a Japanese candy.
When House drives the "gift" he was given down the street together with Wilson, they can be seen driving past a car dealer named "L.A. Cars", despite the show taking place in New Jersey.
During close-ups of the infant when House is pulling the figurines out of the nose, you can see that the infant is actually a doll.
When talking about Joey during his first coma, they say he is "an 8 on the Glasgow scale," which is "almost dead." In reality, an 8 on the scale indicates some degree of movement in response to pain, eye opening in response to pain, and/or a vocal response. A 3 on the scale could be classed as "almost dead," but not an 8.