Galatea's look is loosely based upon the comic book character Power Girl. Her costume is obviously similar (except she does not wear a cape, and her gloves and boots are white instead of blue). In the comics universe, Power Girl was Supergirl's counterpart from Earth-Two, whereas in the DCAU she's a clone. In the comics universe, she is a superhero, whereas in the DCAU, she is a villain. She also resembles Superboy (Kon-El), who is a Cadmus-created clone of Superman.
The Got Fluoride? Poster is not only a Got Milk? parody but references that most American water has slight fluoride levels in it - some claim, for dental hygiene; others, as part a some conspiracy like mind control.
The Question's "ancient Egyptian conspiracy group" is undoubtedly the Illuminati.
The reporter Jerry is drawn to resemble Carl Kolchak, Darren McGavin's character, from the TV series "Kolchak: The Night Stalker (1974)".
The clone's name, Galatea, refers to a character from Greek mythology. Galatea was an ivory statue, created to be the perfect woman by the sculptor Pygmalion, and given life by the goddess Aphrodite to become Pygmalion's wife.