Near the climax of the film, Sarah Purcell and her roommates are gagged and tied hand and foot by the villain. Sarah Purcell hops in stocking feet to a sliding glass door and hurls herself through it to attract attention. When a neighbor breaks in, she is lying on the balcony, her feet now untied and no binding in sight.
Obvious stunt-double is clearly obvious for Delbert when the angry husband beats him up for snooping in the dresser drawers.