Recurring cast members who appear in "Acafellas" are Stephen Tobolowsky as former glee club director Sandy Ryerson, Patrick Gallagher as football coach Ken Tanaka, Iqbal Theba as Principal Figgins, Kent Avenido as Sheets and Things employee Howard Bamboo, and Naya Rivera and Heather Morris as glee club members Santana Lopez and Brittany Pierce.
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Former glee club director Sandy Ryerson (Stephen Tobolowsky) also joins the group, having arranged for singer Josh Groban to be at their next performance.
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Singer Josh Groban guest stars as himself, John Lloyd Young appears as wood shop teacher Henri St. Pierre, and Victor Garber and Debra Monk play Will's parents.
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Although the star compliments their rendition of "I Wanna Sex You Up", he reveals that he only attended to make sure Sandy stopped stalking him.