This episode marks the first time Donna joins the circle.
At the moment Kelso sees Jackie sick in bed with no make up and her hair disshelved, a portion of Carl Orff's "Carmina Burana" is inserted into the soundtrack.
Carolyn Hennesy plays Sharon Singer in season 1, but goes on to play a different character, Patty Ryals, in season 7.
Kelso: "Yeah. No parents would be cool. Like 'The Lord of the Flies'". "The Lord of the Flies" is a 1954 book by William Golding, about a group of boys stranded without parents on an island. They deteriorate into savages.