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Supposedly alien planet: human names again
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Since Brady doesn't seem to do anything about Goalby and Lisa, why can't the Earthlings use Goalby as a continuing ally: he certainly seems helpful enough.
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Supposedly alien planet: Cole Porter lyrics! The Giants don't seem surprised or puzzled at the existence of this song, so presumably they have Cole Porter, Judy Garland, and the 1948 movie The Pirate on their planet (see Cultural References below).
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Supposedly alien planet: circus acts and cliches
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It's not clear why Sandra Giles receives an opening credit, since she only has 2-3 lines of dialogue.
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It is never explained why Bobo is acting in such a hostile manner. It is implied Brady mistreated him in some manner, but this is never stated or shown on-screen.
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We don't see what happens to Brady (although he may have died shortly thereafter - see "The Deadly Dart"). Assuming he's still alive, couldn't he turn the SID loose on Goalby and Lisa for harboring little people?
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Within walking distance: A circus set-up