First and (only) appearance of Sam's twin sister Melanie as well as the first episode where Jennette McCurdy plays two characters.
One of the two dancing girls who causes Freddie to spill his drink in the club later plays Gibby's cousin next season.
Although this is her only appearance on iCarly this would not be the first appearance of Melanie in a Dan Schneider show as she would make a second appearance in the Sam and Cat episode #Twinfection.
Second appearance of T-Bo as well as the second appearance of the Groovy Smoothie.