Voice of Kyle Broflovski; Kenny McKormick; Leopold 'Butters' Stotch; Gerald Broflovski
Voice of Stan Marsh; Eric Theodore Cartman; Randy Marsh; Mr. Garrison
Voice of Sheila Broflovski; Various Other Females
Voice of Liane Cartman; Principal Victoria; Sharon Marsh; Wendy Testaburger; Various Other Females
Kyle doesn't appear in this episode - most probably because he's in Jewscouts and not a member of the Boy Scouts.
In the season 5 episode "Cripple Fight", the boys were in Boy Scouts. Although it is clear that they are 9 years old, and you have to be 11 years old to join.
Now they shift backwards to Cub Scouts, which clearly comes before Boy Scouts. This is an obvious plot hole.
Stan and Cartman are the only one of the main four boys to appear in this episode - Kyle do not appear. Butters appears briefly with Cartman, Kenny appeared with his father, but they have no dialogue.
The Australian Leader shown is John Howard. John Howard has not been the Australian Prime Minister for over 1 & half years.
Randy dresses up as Princess Leia from Star Wars when he steals the superconducting magnet.
The alien's line "Just one more thing" is a reference to the TV series Columbo. Detective Columbo would conduct an interview and exit the scene, only to return moments later and ask, "Just one more thing...".
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