The word 'clinic' appears as a mirror image on the chalkboard. Also, the next scene has the word clinic in a mirror image in the clinic.
This episode reunites two actors from the film "Swing Kids": Robert Sean Leonard (Wilson) and Frank Whaley (Robert Elliot).
The restaurant names that House reads off of the receipts (Knotty Pine and Richie's) are the names of actual restaurants in London, Ontario, hometown of series creator David Shore.
According to the episode synopsis, its title refers to the disease House's patient suffers from and has nothing to do with Snow White. However, the term "Mirror Mirror" also has nothing to do with "Snow White," and the correct phrase that was said is "Magic Mirror."