It is revealed that Robbie wears SpongeBob underwear.
This episode can be compared to the South Park episode Casa Bonita, where Eric Cartman makes a relentless attempt to send Butters missing so he can come with the rest of the gang to a fun restaurant for Kyle's birthday. Also, while Butters does end up not coming with them, the police become aware that it was Cartman who made him go missing and have him arrested, much like how Sikowitz refuses to let Jade perform at the end despite Tori being unable to herself.
Jade should receive consequences for continually trying to sabotage Tori and get her removed from the play. Academic misconduct is a punishable act.