June Foray provided the voices of Karen, the Teacher and the other children. However, starting with the third airing of the special, most of her recordings as Karen and the other children were replaced with the voices of actual young children. Her voice can still be heard in subsequent airings of the special in some of the other children's dialogue. No changes were made to the credits, so the actual child voice actors remain unknown and uncredited. Foray's voices can be heard on the Rhino Records soundtrack.