Rivers Cuomo

Himself

Patrick Wilson

Himself

Brian Bell

Himself

Matt Sharp

Himself / Party Goer in "Undone" (voice)

Mikey Welsh

Himself

Scott Shriner

Himself

Karl Koch

Himself / Party Goer in "Undone" (voice)

Mykel Allen

Herself / Party Goer in "Undone" (voice)

Al Molinaro

Al Delvecchio ("Buddy Holly")

Casey Storm

Fonzie Dance Double ("Buddy Holly")

Henry Winkler

Fonzie ("Buddy Holly") (archive footage)

Tom Bosley

Howard Cunningham ("Buddy Holly") (voice) (archive footage)