Other mistake: When House is inserting foil pieces in the wall socket to create a short circuit in order to ignite a roll of toilet paper, he touches both pieces of foil simultaneously, which should have electrocuted him. (00:30:30)
Here Kitty - S5-E18
Continuity mistake: Series 5, Episode 18, "Here Kitty": When Judy (the patient) holds the tape out for House before her bronchial attack, the way she holds it changes instantly. (00:13:45)





Answer: It comes from the phrase "Everything but the kitchen sink." He's saying that House has thought of "everything but the kitchen sink."
Garlonuss ★