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That Darn Cat!
The cat that visits J'onn (presumably Kara's) looks suspiciously like Streaky the Supercat, a beloved (??) pre-Crisis part of the Superman mythos. It looks a bit more mangled and scrawny then Streaky ever did - in fact, it looks a bit like the cat that Power Girl (originally a Earth-2 version of Supergirl) has as a pet in the current post-Crisis DC universe.
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J'onn's Christmas Gift
The sweater that the Kent's give J'onn for Christmas has a single horizontal zig-zag stripe pattern on it - seemingly a reference to Charlie Brown, another character who is also searching for the "true" meaning of Christmas in the animated classic, A Charlie Brown Christmas. Based on Charles Shultz's Peanuts comic strip, the popular holiday cartoon has been shown on television every year during the Christmas holidays since 1965 and aired on CBS the same night this episode premiered.
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Saunders Family Connection?
In DC Comics, Kendra Saunders is the name of the current Hawkgirl, Shayera Hol's successor (sort of - it's a loonnngg story). The name of the orphanage lady is also "Saunders" - probably an in-joke gag.
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Zooked
Starting in Detective #311 and following him into House of Mystery, J'onn J'onzz had an alien sidekick named Zook. He appears briefly in this episode as the orange stuffed animal the camera pans to for several seconds on Kara's bed.
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Other Cameos
Among the other "aliens" you can see outside the cantina are Swamp Thing (albeit somewhat orangish), a Jack Kirby-style Frankenstein's monster, and a Edward G. Robinson version of either MODOK (from Marvel) or Slimer (Ghostbusters) or some mix of both. A very strange addition is Edward G. Robinson's head on a robot body floating by.
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Everybody in the Bar: Shayera!
Alluding to the TV series Cheers, where Norm would walk in and say hi and get a unanimous response of everyone saying his name.
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Ultrahumanite: I suggest Voltaire.
Voltaire was one of the greatest thinkers of the Enlightenment. And like the Ultra-Humanite, thought negatively of human nature.
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Hawk Man and Lion Man: passing in the background
Two alien characters passing behind GL and Hawkgirl look suspiciously like a Lion Man and a Hawk Man from the Flash Gordon comic strip, movie, Filmation TV series, etc. Having a "Hawk Man" from a different cartoon may also be an in-joke reference to the DC "Hawkman", a version of which will be appearing in Star-Crossed.
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Ultrahumanite/DJ Rubber Ducky: Little Clara had just received a beautiful toy Nutcracker...
The book that Ultra-Humanite has programmed DJ Rubber Ducky to read to the children is The Nutcracker and the Mouse King by E.T.A. Hoffman and later turned into a ballet by Tchaikovsky.