City Sushi/Trivia

Trivia

 * Janus is a Roman god generally depicted with two faces on the front and back of his head. Although he's considered the god of beginnings and endings, in this case it's also a reference to Dr. Janus having multiple "faces" (personalities).
 * When Butters is burning his other identities, he says "No more porn star Butters" this may mean he had underage sex, or just likes pretending to have sex.
 * Cartman, Stan, Kenny, and Kyle have no speaking lines in this episode, and they only appear once in the audience when Tuong Lu Kim and the Japanese man are talking about Asian Diversity. As Kenny did not appear in the previous episode also, this marks the second episode in role Kenny says or does nothing this season.
 * Inspector Butters is a reference to the episode, "Butters' Very Own Episode", where Butters follows his father around for his mother.
 * The word 'Shit' is once again uncensored.
 * Butters mentions Professor Chaos, his dark alter ego from "Professor Chaos", and other past episodes. However how he mentions him suggests he now only sees Chaos as a play character rather than his desire for revenge.
 * City Wok is not the only Chinese restaurant in South Park. There is also a P.F. Chang's, however, it could've been destroyed in an episode where the town faces destruction, like "Pandemic 2: The Startling " or "201 ".
 * A running gag throughout the episode is the other characters unable to see a difference between Chinese and Japanese people, as they always refer City Sushi as a Chinese Restaurant and from the "increased Chinese culture" they name the area Little Tokyo, which is Japanese.
 * Dr. Janus has at least seven split personalites not including himself; The Old Man, Billy, The Evil Psycotic One, The Con Artist, The Pizza Man, The One Who Sings, and Lu Kim. Butters burns all his alter egos except Proffessor Chaos which means he might return.

References to Popular Culture

 * When Butters films himself, it is a parody of Paranormal Activity, proven when Butters says, "This is like Paranormal."
 * The final scene where Tuong Lu Kim is sitting in prison and saying he "doesn't harm a fly" is a reference to Psycho.

Continuity

 * Butters previously underwent psychiatric evaluation in "The Death of Eric Cartman", when his parents thought he was hallucinating and seeing a ghost.
 * The Stotches immediately dismiss their son's "trouble making" as not because of their parenting, claiming "they're awesome". Once again playing on the fact they are completely oblivious to how cold and harsh they treat him.
 * Once again Butters is completely blamed for something he has practically little involvement in, and is grounded.
 * Inspector Butters is from "Butters' Very Own Episode".
 * The Japanese man is from "HUMANCENTiPAD ".

Goofs

 * In the press release from South Park Studios, part of the description (or synopsis) of the episode was given as, "the boys want to help Butters find out what's really happening to him but Butters may not like what they find". However, this could've been changed from the episode of South Park Studios kept it the same.